// formChecker v1.5.0 (February 7, 2007) by Bramus! 
// http://www.bram.us/
//
// License : don't use, nor modify without Bramus! his permission.
//
// Checking routines based upon http://juicystudio.com/article/generic-form-validation.php/
//
// v 1.6.0	sunday, Octobre 14, 2007
// 			- CHANGE 	: while not wanting this to depend on prototype, extra checks are mad to ensure everything works fine
//							checks to the existance of id formSubmit and spinner
//							adding them to ensure no error is envoked resulting in a submit of the form (ajax)
//
// v 1.5.0 - Wednesday, February 7, 2007
//			- CHANGE	: Dateverification no longer depends on _my_ datepicker, since frequencydecoder his implementation 
// 						  is way more flexible and dynamic than mine
//			- CHANGE	: Due to the change above, the date validation needed to be real now (and not just checking on a string).
// 						  Implementation modded from http://www.codetoad.com/forum/17_10053.asp
//
// v 1.4.2 - Wednesday, November 29, 2006
//			- FEATURE	: added isUrl (http & ftp & https only)
//
// v 1.4.1 - Wednesday, August 23, 20006
//			- BUGFIX	: Minor bugfix in _isDate
//
// v 1.4 - Monday, August 7, 2006
//			- FEATURE 	: checkForm now shows and errormessage into an element with id=error_{nameofthefield}, if it is found. (backdrop from iedereenleeftmee)
//			- FEATURE	: possibility to make fields optional by adding optional to the class of the element
//			- CHANGE	: instead of selecting all children from the form by calling objForm.getElementsByTagName('*'),
//						  now only the following elements are selected: input, textarea, select
//
// v 1.3 - Monday, July 31, 2006
//			- CHANGE 	: greatly tweaked checkBox & radio checking (complete overhaul)
//
// v 1.2 - Somewhere in June 2006
//			- FEATURE 	: checkBox & radio checking
//
// v 1.1 - Somewhere in Q1 2006
//			- FEATURE 	: added isDate
//
// v 1.0 - Somewhere Q3 2005
//			- first version
//
// some stuff one needs to read before sinning against Exodus 20.15 (*)!
// - to validate a checkbox, you must place it in a label and give the label lbl_$item as id
//
// (*) See http://www.biblegateway.com/passage/?search=exodus%2020.15&version=31 for more details on Exodus 20.15 ;)

var formChecker = {

	okColor			: '',									// background to set when value is ok (textfield, textarea, select)
	nokColor		: '',	/* '#ea9b9b', */				// background to set when value is not ok	
	okTextColor		: '#000000',									// background to set when value is ok (checkbox/radiobutton)
	nokTextColor	: '#000000',	/* '#CF2639', */				// background to set when value is not ok (checkbox/radiobutton)
	nokMessage		: 'An error was found, please check the highlighted fields',		// message to alert when form not ok, leave empty to not alert any message
	
	errorMsgSelect	: 'Please select a value',						// message to show on screen when select not ok
	errorMsgCheck	: 'Please make a choice',						// message to show on screen when checkbox/radiobutton not ok
	errorMsgString	: 'Please complete this field',					// message to show on screen when a textfield is empty
	errorMsgNumber	: 'Please enter a number',						// message to show on screen when no number was entered
	errorMsgEmail	: 'Please enter a valid e-mailaddress',			// message to show on screen when no e-mail was entered
	errorMsgUrl		: 'Please enter a valid url',					// message to show on screen when no url was entered
	errorMsgDate	: 'Please choose a date',						// message to show on screen when no date was selected
	errorMsgCaptcha : 'Please enter the right sum',
	colorForm		: '',

	checkForm		: function (daForm) {						
						var arClass, bValid, gotError;		  
						var objForm= daForm;
						
						formChecker.colorForm = objForm.style.backgroundColor;	
						
						//var objField	= objForm.getElementsByTagName('*');	// old method : got ALL items (including labels and such)		
						var objField 	= formChecker._mergeNodeLists(
										  		objForm.getElementsByTagName('input'), 
										  		objForm.getElementsByTagName('textarea'), 
										  		objForm.getElementsByTagName('select')
										   ); 
						
						gotError = false;
						if (document.getElementById('formSubmit')) {
							var button = document.getElementById('formSubmit');
						} else if(document.getElementById('newsletterSubmit')) {
							var button = document.getElementById('newsletterSubmit');
						} else if(objForm.submit == undefined) {
							alert("Error, no submit button could be found (no formSubmit, nor button with the name submit");
						} else {
							var button = objForm.submit;							
						}
						/*button.disabled		= true;*/
						if (document.getElementById('spinner')) {
							document.getElementById('spinner').style.visibility	= 'visible';
						} else {
							objForm.style.background = "#FFFFCC";
						}
						
						for (var iFieldCounter=0; iFieldCounter<objField.length; iFieldCounter++) {
						
							// Allow for multiple values being assigned to the class attribute
							arClass = objField[iFieldCounter].className.split(' ');
							
							for (var iClassCounter=0; iClassCounter<arClass.length; iClassCounter++) {
								
								//console.debug("checking item '%s' with class '%s'", objField[iFieldCounter].name, arClass[iClassCounter]);
							
								switch (arClass[iClassCounter]) {
								
									case 'select':		      	
										bValid 		= formChecker._isSelected(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgSelect;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										break;
									case 'check':		      	
										bValid 		= formChecker._isChecked(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgCheck;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										break;
									case 'string':
										bValid 		= formChecker._isString(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgString;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										break;
									case 'number' :
										bValid 		= formChecker._isNumber(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgNumber;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										break;
									case 'url' :
										bValid 		= formChecker._isUrl(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgUrl;
										break;
									case 'email' :
										bValid 		= formChecker._isEmail(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgEmail;
										break;
									case 'date' :
										bValid 		= formChecker._isDate(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgDate;
										//console.debug(objField[iFieldCounter].name+ " -> " + bValid);
										break;
									case 'captcha' :
										bValid		= formChecker._isCaptcha(objField[iFieldCounter]);
										errorMsg	= formChecker.errorMsgCaptcha;
										break;
									default:
										bValid = 'NULL';
										break;
								}
								
								
					
								if (bValid == false) {
					
									gotError = true;
									
									// date : color the label
									if(arClass[iClassCounter] == 'check') {
										var elems = document.getElementsByName(objField[iFieldCounter].name);
										for (var i=0; i<elems.length; i++) {
											document.getElementById('lbl_' + elems[i].id).style.color = formChecker.nokTextColor;
										}
									// normal : color the item
									} else {
										//objField[iFieldCounter].focus();
										objField[iFieldCounter].style.background = formChecker.nokColor;
									}
								
									// set errorMessage	
									if (document.getElementById("error_" + objField[iFieldCounter].name)) {
										document.getElementById("error_" + objField[iFieldCounter].name).innerHTML			= errorMsg;
										document.getElementById("error_" + objField[iFieldCounter].name).style.visibility	= 'visible';
									}
									
								} else {
									
									if (bValid != 'NULL') {		
										// date : color the label
										if(arClass[iClassCounter] == 'check') {
											var elems = document.getElementsByName(objField[iFieldCounter].name);
											for (var i=0; i<elems.length; i++) {
												document.getElementById('lbl_' + elems[i].id).style.color = formChecker.okTextColor;
											}
										// normal : color the item
										} else {
											//objField[iFieldCounter].focus();
											objField[iFieldCounter].style.background = formChecker.okColor;
										}
										
										// unset errorMessage									
										if (document.getElementById("error_" + objField[iFieldCounter].name)) {
											document.getElementById("error_" + objField[iFieldCounter].name).innerHTML			= '';
											document.getElementById("error_" + objField[iFieldCounter].name).style.visibility	= 'hidden';
										}
									}	
									
								}
							}
						}
						
						if (gotError) {
							
							button.disabled		= false;							
							
							if (document.getElementById('spinner')) {
								document.getElementById('spinner').style.visibility	= 'hidden';
							} else {
								objForm.style.background = formChecker.colorForm;
							}
							
							if (formChecker.nokMessage != '') {
								//alert(formChecker.nokMessage);
								if (daForm.id != 'frmNewsletter') {
									document.getElementById('notification').innerHTML = document.getElementById('errMsgContact').value;
									document.getElementById('notification').style.display = 'block';
								} else {
									document.getElementById('errNewsletter').innerHTML = document.getElementById('errMsgNewsletter').value;
								}
							}
							
							return false;
							
						} else {
							if (!document.getElementById('spinner')) {								
								objForm.style.background = formChecker.colorForm;
							}
							return true						
							
						}
					
	},
	
	_mergeNodeLists		: function (objInput, objTextarea, objSelect) {
	
							var objField = new Array();
							
							if (objInput.length != 0) {
								for (i = 0; i < objInput.length; i++) {
									objField[i]	= objInput.item(i);	
								}
							}
							
							if (objTextarea.length != 0) {
								for (i = 0; i < objTextarea.length; i++) {
									objField[objInput.length + i]	= objTextarea.item(i);	
								}
							}
							
							if (objSelect.length != 0) {
								for (i = 0; i < objSelect.length; i++) {
									objField[objInput.length + objTextarea.length + i]	= objSelect.item(i);	
								}
							}	
							
							return objField;
	},
	
	_isOptional			: function(className) {
							//alert(className);
							var re = new RegExp("optional");
							var m = re.exec(className);
							if (m == null) {
								return false;
							} else {
								return true;
							}
	},
		
	_isSelected			: function (objField) {
							if (formChecker._isOptional(objField.className) && (objField.selectedIndex == 0)) {
								return true;
							} else {
								if (objField.selectedIndex == 0) {
									return false;
								} else {
									return true;
								}
							}
	},
	
	_isChecked			: function (objField) {
							var arrOptions = document.getElementsByName(objField.name);
							for (var i=0; i<arrOptions.length; i++) {
								if (arrOptions[i].checked) return true;
							}
							return false;
	},
		
	_isString			: function (objField) {
							strValue	= objField.value.replace(/^\s*|\s*$/g, '');
							if (formChecker._isOptional(objField.className) && (strValue == "")) {
								return true;
							} else {
								return (typeof strValue == 'string' && strValue != ''); //  && isNaN(strValue)
							}
	},
		
	_isNumber			: function (objField) {
							strValue	= objField.value;
							if (formChecker._isOptional(objField.className) && (strValue == "")) {
								return true;
							} else {
								return (!isNaN(strValue) && strValue != '');
							}
	},
		
	_isEmail			: function (objField) {
							strValue	= objField.value;
							if (formChecker._isOptional(objField.className) && (strValue == "")) {
								return true;
							} else {
								var objRE = /^[\w-\.\']{1,}\@([\da-zA-Z-]{1,}\.){1,}[\da-zA-Z-]{2,}$/;
								return (strValue != '' && objRE.test(strValue));
							}
	},
	
	_isUrl				: function (objField) {	
							strValue	= objField.value;
							if (formChecker._isOptional(objField.className) && (strValue == "")) {
								return true;
							} else {
								var regexp = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/
								return regexp.test(strValue);
							}	
	},
	
	_isCaptcha          : function (objField) {
							strValue	= objField.value;
							strTest		= document.getElementById("xxyyzz").value;
							if (hex_md5(strValue) == strTest){
								return true;
							} else {
								return false;
							}
	},

	_isDate				: function (objField) {
							strValue	= objField.value;
							if (formChecker._isOptional(objField.className) && (strValue == "")) {
								return true;
							} else {
								//return !isNaN(new Date(strValue));		// <<--- this needs checking
								//return !isNaN(Date.parse(strValue));		// <<--- this needs checking -->> only works with / as divider
								
								var dateStr		= strValue;
								var datePat 	= /^(\d{4})(\/|-)(\d{1,2})(\/|-)(\d{1,2})$/; // (YYYY-MM-DD) or (YYYY/MM/DD)
								var matchArray 	= dateStr.match(datePat); // is the format ok?
								
								if (matchArray == null) {
									return false;
								}
								
								year 	= matchArray[1]; // parse date into variables
								month 	= matchArray[3];
								day 	= matchArray[5];
								
								if (month < 1 || month > 12) { // check month range
									// alert("Month must be between 1 and 12.");
									return false;
								}
								
								if (day < 1 || day > 31) {
									// alert("Day must be between 1 and 31.");
									return false;
								}
								
								if ((month==4 || month==6 || month==9 || month==11) && day==31) {
									// alert("Month "+month+" doesn't have 31 days!")
									return false;
								}
								
								if (month == 2) { // check for february 29th
									var isleap = (year % 4 == 0 && (year % 100 != 0 || year % 400 == 0));
									if (day > 29 || (day==29 && !isleap)) {
										// alert("February " + year + " doesn't have " + day + " days!");
										return false;
									}
								}
								return true; // date is valid
							}
	}
}

/*
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
var hexcase = 0;   /* hex output format. 0 - lowercase; 1 - uppercase        */
var b64pad  = "";  /* base-64 pad character. "=" for strict RFC compliance   */

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
function hex_md5(s)    { return rstr2hex(rstr_md5(str2rstr_utf8(s))); }
function b64_md5(s)    { return rstr2b64(rstr_md5(str2rstr_utf8(s))); }
function any_md5(s, e) { return rstr2any(rstr_md5(str2rstr_utf8(s)), e); }
function hex_hmac_md5(k, d)
  { return rstr2hex(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); }
function b64_hmac_md5(k, d)
  { return rstr2b64(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d))); }
function any_hmac_md5(k, d, e)
  { return rstr2any(rstr_hmac_md5(str2rstr_utf8(k), str2rstr_utf8(d)), e); }

/*
 * Perform a simple self-test to see if the VM is working
 */
function md5_vm_test()
{
  return hex_md5("abc").toLowerCase() == "900150983cd24fb0d6963f7d28e17f72";
}

/*
 * Calculate the MD5 of a raw string
 */
function rstr_md5(s)
{
  return binl2rstr(binl_md5(rstr2binl(s), s.length * 8));
}

/*
 * Calculate the HMAC-MD5, of a key and some data (raw strings)
 */
function rstr_hmac_md5(key, data)
{
  var bkey = rstr2binl(key);
  if(bkey.length > 16) bkey = binl_md5(bkey, key.length * 8);

  var ipad = Array(16), opad = Array(16);
  for(var i = 0; i < 16; i++)
  {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5C5C5C5C;
  }

  var hash = binl_md5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
  return binl2rstr(binl_md5(opad.concat(hash), 512 + 128));
}

/*
 * Convert a raw string to a hex string
 */
function rstr2hex(input)
{
  try { hexcase } catch(e) { hexcase=0; }
  var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
  var output = "";
  var x;
  for(var i = 0; i < input.length; i++)
  {
    x = input.charCodeAt(i);
    output += hex_tab.charAt((x >>> 4) & 0x0F)
           +  hex_tab.charAt( x        & 0x0F);
  }
  return output;
}

/*
 * Convert a raw string to a base-64 string
 */
function rstr2b64(input)
{
  try { b64pad } catch(e) { b64pad=''; }
  var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  var output = "";
  var len = input.length;
  for(var i = 0; i < len; i += 3)
  {
    var triplet = (input.charCodeAt(i) << 16)
                | (i + 1 < len ? input.charCodeAt(i+1) << 8 : 0)
                | (i + 2 < len ? input.charCodeAt(i+2)      : 0);
    for(var j = 0; j < 4; j++)
    {
      if(i * 8 + j * 6 > input.length * 8) output += b64pad;
      else output += tab.charAt((triplet >>> 6*(3-j)) & 0x3F);
    }
  }
  return output;
}

/*
 * Convert a raw string to an arbitrary string encoding
 */
function rstr2any(input, encoding)
{
  var divisor = encoding.length;
  var i, j, q, x, quotient;

  /* Convert to an array of 16-bit big-endian values, forming the dividend */
  var dividend = Array(Math.ceil(input.length / 2));
  for(i = 0; i < dividend.length; i++)
  {
    dividend[i] = (input.charCodeAt(i * 2) << 8) | input.charCodeAt(i * 2 + 1);
  }

  /*
   * Repeatedly perform a long division. The binary array forms the dividend,
   * the length of the encoding is the divisor. Once computed, the quotient
   * forms the dividend for the next step. All remainders are stored for later
   * use.
   */
  var full_length = Math.ceil(input.length * 8 /
                                    (Math.log(encoding.length) / Math.log(2)));
  var remainders = Array(full_length);
  for(j = 0; j < full_length; j++)
  {
    quotient = Array();
    x = 0;
    for(i = 0; i < dividend.length; i++)
    {
      x = (x << 16) + dividend[i];
      q = Math.floor(x / divisor);
      x -= q * divisor;
      if(quotient.length > 0 || q > 0)
        quotient[quotient.length] = q;
    }
    remainders[j] = x;
    dividend = quotient;
  }

  /* Convert the remainders to the output string */
  var output = "";
  for(i = remainders.length - 1; i >= 0; i--)
    output += encoding.charAt(remainders[i]);

  return output;
}

/*
 * Encode a string as utf-8.
 * For efficiency, this assumes the input is valid utf-16.
 */
function str2rstr_utf8(input)
{
  var output = "";
  var i = -1;
  var x, y;

  while(++i < input.length)
  {
    /* Decode utf-16 surrogate pairs */
    x = input.charCodeAt(i);
    y = i + 1 < input.length ? input.charCodeAt(i + 1) : 0;
    if(0xD800 <= x && x <= 0xDBFF && 0xDC00 <= y && y <= 0xDFFF)
    {
      x = 0x10000 + ((x & 0x03FF) << 10) + (y & 0x03FF);
      i++;
    }

    /* Encode output as utf-8 */
    if(x <= 0x7F)
      output += String.fromCharCode(x);
    else if(x <= 0x7FF)
      output += String.fromCharCode(0xC0 | ((x >>> 6 ) & 0x1F),
                                    0x80 | ( x         & 0x3F));
    else if(x <= 0xFFFF)
      output += String.fromCharCode(0xE0 | ((x >>> 12) & 0x0F),
                                    0x80 | ((x >>> 6 ) & 0x3F),
                                    0x80 | ( x         & 0x3F));
    else if(x <= 0x1FFFFF)
      output += String.fromCharCode(0xF0 | ((x >>> 18) & 0x07),
                                    0x80 | ((x >>> 12) & 0x3F),
                                    0x80 | ((x >>> 6 ) & 0x3F),
                                    0x80 | ( x         & 0x3F));
  }
  return output;
}

/*
 * Encode a string as utf-16
 */
function str2rstr_utf16le(input)
{
  var output = "";
  for(var i = 0; i < input.length; i++)
    output += String.fromCharCode( input.charCodeAt(i)        & 0xFF,
                                  (input.charCodeAt(i) >>> 8) & 0xFF);
  return output;
}

function str2rstr_utf16be(input)
{
  var output = "";
  for(var i = 0; i < input.length; i++)
    output += String.fromCharCode((input.charCodeAt(i) >>> 8) & 0xFF,
                                   input.charCodeAt(i)        & 0xFF);
  return output;
}

/*
 * Convert a raw string to an array of little-endian words
 * Characters >255 have their high-byte silently ignored.
 */
function rstr2binl(input)
{
  var output = Array(input.length >> 2);
  for(var i = 0; i < output.length; i++)
    output[i] = 0;
  for(var i = 0; i < input.length * 8; i += 8)
    output[i>>5] |= (input.charCodeAt(i / 8) & 0xFF) << (i%32);
  return output;
}

/*
 * Convert an array of little-endian words to a string
 */
function binl2rstr(input)
{
  var output = "";
  for(var i = 0; i < input.length * 32; i += 8)
    output += String.fromCharCode((input[i>>5] >>> (i % 32)) & 0xFF);
  return output;
}

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length.
 */
function binl_md5(x, len)
{
  /* append padding */
  x[len >> 5] |= 0x80 << ((len) % 32);
  x[(((len + 64) >>> 9) << 4) + 14] = len;

  var a =  1732584193;
  var b = -271733879;
  var c = -1732584194;
  var d =  271733878;

  for(var i = 0; i < x.length; i += 16)
  {
    var olda = a;
    var oldb = b;
    var oldc = c;
    var oldd = d;

    a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
    d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
    c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
    b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
    a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
    d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
    c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
    b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
    a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
    d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
    c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
    b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
    a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
    d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
    c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
    b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

    a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
    d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
    c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
    b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
    a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
    d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
    c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
    b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
    a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
    d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
    c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
    b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
    a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
    d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
    c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
    b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

    a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
    d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
    c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
    b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
    a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
    d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
    c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
    b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
    a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
    d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
    c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
    b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
    a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
    d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
    c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
    b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

    a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
    d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
    c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
    b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
    a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
    d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
    c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
    b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
    a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
    d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
    c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
    b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
    a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
    d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
    c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
    b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

    a = safe_add(a, olda);
    b = safe_add(b, oldb);
    c = safe_add(c, oldc);
    d = safe_add(d, oldd);
  }
  return Array(a, b, c, d);
}

/*
 * These functions implement the four basic operations the algorithm uses.
 */
function md5_cmn(q, a, b, x, s, t)
{
  return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
function md5_ff(a, b, c, d, x, s, t)
{
  return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
function md5_gg(a, b, c, d, x, s, t)
{
  return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
function md5_hh(a, b, c, d, x, s, t)
{
  return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
function md5_ii(a, b, c, d, x, s, t)
{
  return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}

/*
 * Add integers, wrapping at 2^32. This uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
function safe_add(x, y)
{
  var lsw = (x & 0xFFFF) + (y & 0xFFFF);
  var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xFFFF);
}

/*
 * Bitwise rotate a 32-bit number to the left.
 */
function bit_rol(num, cnt)
{
  return (num << cnt) | (num >>> (32 - cnt));
}