function utf8_encode ( str_data ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
    // *     example 1: utf8_encode('Kevin van Zonneveld');
    // *     returns 1: 'Kevin van Zonneveld'
 
    str_data = str_data.replace(/\r\n/g,"\n");
    var utftext = "";
 
    for (var n = 0; n < str_data.length; n++) {
        var c = str_data.charCodeAt(n);
        if (c < 128) {
            utftext += String.fromCharCode(c);
        } else if((c > 127) && (c < 2048)) {
            utftext += String.fromCharCode((c >> 6) | 192);
            utftext += String.fromCharCode((c & 63) | 128);
        } else {
            utftext += String.fromCharCode((c >> 12) | 224);
            utftext += String.fromCharCode(((c >> 6) & 63) | 128);
            utftext += String.fromCharCode((c & 63) | 128);
        }
    }
 
    return utftext;
}

function md5 ( str ) {
    // http://kevin.vanzonneveld.net
    // +   original by: Webtoolkit.info (http://www.webtoolkit.info/)
    // -    depends on: utf8_encode
    // *     example 1: md5('Kevin van Zonneveld');
    // *     returns 1: '6e658d4bfcb59cc13f96c14450ac40b9'
 
 
    function RotateLeft(lValue, iShiftBits) {
        return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits));
    }
 
    function AddUnsigned(lX,lY) {
        var lX4,lY4,lX8,lY8,lResult;
        lX8 = (lX & 0x80000000);
        lY8 = (lY & 0x80000000);
        lX4 = (lX & 0x40000000);
        lY4 = (lY & 0x40000000);
        lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
        if (lX4 & lY4) {
            return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
        }
        if (lX4 | lY4) {
            if (lResult & 0x40000000) {
                return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
            } else {
                return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
            }
        } else {
            return (lResult ^ lX8 ^ lY8);
        }
    }
 
    function F(x,y,z) { return (x & y) | ((~x) & z); }
    function G(x,y,z) { return (x & z) | (y & (~z)); }
    function H(x,y,z) { return (x ^ y ^ z); }
    function I(x,y,z) { return (y ^ (x | (~z))); }
 
    function FF(a,b,c,d,x,s,ac) {
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
        return AddUnsigned(RotateLeft(a, s), b);
    }
 
    function GG(a,b,c,d,x,s,ac) {
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
        return AddUnsigned(RotateLeft(a, s), b);
    }
 
    function HH(a,b,c,d,x,s,ac) {
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
        return AddUnsigned(RotateLeft(a, s), b);
    }
 
    function II(a,b,c,d,x,s,ac) {
        a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
        return AddUnsigned(RotateLeft(a, s), b);
    }
 
    function ConvertToWordArray(str) {
        var lWordCount;
        var lMessageLength = str.length;
        var lNumberOfWords_temp1=lMessageLength + 8;
        var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
        var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
        var lWordArray=Array(lNumberOfWords-1);
        var lBytePosition = 0;
        var lByteCount = 0;
        while ( lByteCount < lMessageLength ) {
            lWordCount = (lByteCount-(lByteCount % 4))/4;
            lBytePosition = (lByteCount % 4)*8;
            lWordArray[lWordCount] = (lWordArray[lWordCount] | (str.charCodeAt(lByteCount)<<lBytePosition));
            lByteCount++;
        }
        lWordCount = (lByteCount-(lByteCount % 4))/4;
        lBytePosition = (lByteCount % 4)*8;
        lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
        lWordArray[lNumberOfWords-2] = lMessageLength<<3;
        lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
        return lWordArray;
    }
 
    function WordToHex(lValue) {
        var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
        for (lCount = 0;lCount<=3;lCount++) {

            lByte = (lValue>>>(lCount*8)) & 255;
            WordToHexValue_temp = "0" + lByte.toString(16);
            WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
        }
        return WordToHexValue;
    }
 
    var x=Array();
    var k,AA,BB,CC,DD,a,b,c,d;
    var S11=7, S12=12, S13=17, S14=22;
    var S21=5, S22=9 , S23=14, S24=20;
    var S31=4, S32=11, S33=16, S34=23;
    var S41=6, S42=10, S43=15, S44=21;
 
    str = utf8_encode(str);
    x = ConvertToWordArray(str);
    a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
 
    for (k=0;k<x.length;k+=16) {
        AA=a; BB=b; CC=c; DD=d;
        a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
        d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
        c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
        b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
        a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
        d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
        c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
        b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
        a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
        d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
        c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
        b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
        a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
        d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
        c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
        b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
        a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
        d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
        c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
        b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
        a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
        d=GG(d,a,b,c,x[k+10],S22,0x2441453);
        c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
        b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
        a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
        d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
        c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
        b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
        a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
        d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
        c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
        b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
        a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
        d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
        c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
        b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
        a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
        d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
        c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
        b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
        a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
        d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
        c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
        b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
        a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
        d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
        c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
        b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
        a=II(a,b,c,d,x[k+0], S41,0xF4292244);
        d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
        c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
        b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
        a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
        d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
        c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
        b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
        a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
        d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
        c=II(c,d,a,b,x[k+6], S43,0xA3014314);
        b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
        a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
        d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
        c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
        b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
        a=AddUnsigned(a,AA);
        b=AddUnsigned(b,BB);
        c=AddUnsigned(c,CC);
        d=AddUnsigned(d,DD);
    }
 
    var temp = WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
 
    return temp.toLowerCase();
}
//function to apply trim operation on string, as same as php trim() function
function echeck(str) {

		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)
		if (str.indexOf(at)==-1){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		   alert("Invalid E-mail ID")
		   return false
		}

		if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		    alert("Invalid E-mail ID")
		    return false
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false
		 }

 		 return true					
	}
	
	function trim(str)
	{
		return str.replace(/^\s+|\s+$/g,'');
	}

function check_pwd()
{
 var quiz_pwd = document.getElementById("quiz_pwd").value; 
 var quizpwd = md5(quiz_pwd);
 var quiz_correcr_pwd = document.getElementById("quiz_correcr_pwd").value; 	
if(quiz_pwd=='')
{
alert("Please Enter Password Of This Quiz");
document.quizstartForm.quiz_pwd.focus();
return false;
}
if(quizpwd != quiz_correcr_pwd)
{
alert("Incorrect Password, Please Try Again");
document.quizstartForm.quiz_pwd.select();
return false;
}
return true;
}

function check_print_pwd()
{
 var nreq = document.quizpwdForm.nreq.value; 
 var usrname = trim(document.quizpwdForm.usrname.value);
 var pquiz_pwd = document.quizpwdForm.pquiz_pwd.value; 
 var pquizpwd = md5(pquiz_pwd);
 var pquiz_correcr_pwd = document.quizpwdForm.pquiz_correcr_pwd.value; 
 if((nreq==1) && (usrname == ''))
	{
	alert("Please Enter Your Name");
	document.quizpwdForm.usrname.value = '';
	document.quizpwdForm.usrname.focus();
	return false;
	}
 if(pquiz_pwd=='')
{
alert("Please Enter Password Of This Quiz");
document.quizpwdForm.pquiz_pwd.focus();
return false;
}
if(pquizpwd != pquiz_correcr_pwd)
{
alert("Incorrect Password, Please Try Again");
document.quizpwdForm.pquiz_pwd.select();
return false;
}
return true;
}

/* proprofscc: this function is used when the quiz is pasowrd protected, 
then this function will check that user eneterd the correct passowrd or 
not if not then it will show the corresponding error else it will submit the form;
code starts */
function startQuiz()
{
				var quiz_required_name = document.getElementById("quiz_required_name").value;
				var quiz_required_pwd = trim(document.getElementById("quiz_required_pwd").value);
				var quiz_required_email = document.getElementById("quiz_required_email").value;
				var quiz_required_id = document.getElementById("quiz_required_id").value;
				if(quiz_required_name == 1)
				{
					var usrname = trim(document.getElementById("usrname").value);
					if(usrname ==''){
					alert("Please Enter Your Name");
					document.getElementById("usrname").value = '';
					document.quizstartForm.usrname.focus();
					return false;
					}
				}
				if(quiz_required_pwd == 1)
				{
					var quiz_pwd = document.getElementById("quiz_pwd").value; 
					var quizpwd = md5(quiz_pwd);
					var quiz_correcr_pwd = document.getElementById("quiz_correcr_pwd").value;
					if(quiz_pwd=='')
					{
					alert("Please Enter Password Of This Quiz");
					document.quizstartForm.quiz_pwd.focus();
					return false;
					}
					if(quizpwd != quiz_correcr_pwd)
					{
					alert("Incorrect Password, Please Try Again");
					document.quizstartForm.quiz_pwd.select();
					return false;
					}					
				}
				if(quiz_required_id == 1)
				{
					var required_id = trim(document.getElementById("required_id").value);
					if(required_id ==''){
					alert("Please Enter Your ID");
					document.getElementById("required_id").value = '';
					document.quizstartForm.required_id.focus();
					return false;
					}
				}
				if(quiz_required_email == 1)
				{
					var required_email = trim(document.getElementById("required_email").value);
					if ((required_email==null)||(required_email=="")){
					alert("Please Enter Your Email ID")
					document.quizstartForm.required_email.focus();
					return false;
					}
					
					if (echeck(required_email)==false){
					document.quizstartForm.required_email.select();
					return false;
					}				
				}
				return true;
       }
/*proprofscc: code ends */


function startpwdQuiz()
{
				var quiz_required_name = document.getElementById("p_quiz_required_name").value;
				var quiz_required_pwd = trim(document.getElementById("p_quiz_required_pwd").value);
				var quiz_required_email = document.getElementById("p_quiz_required_email").value;
				var quiz_required_id = document.getElementById("p_quiz_required_id").value;
				if(quiz_required_name == 1)
				{
					var usrname = trim(document.getElementById("p_usrname").value);
					if(usrname ==''){
					alert("Please Enter Your Name");
					document.getElementById("p_usrname").value = '';
					document.quizpwdForm.usrname.focus();
					return false;
					}
				}
				if(quiz_required_pwd == 1)
				{
					var quiz_pwd = document.getElementById("pquiz_pwd").value; 
					var quizpwd = md5(quiz_pwd);
					var quiz_correcr_pwd = document.getElementById("pquiz_correcr_pwd").value;
					if(quiz_pwd=='')
					{
					alert("Please Enter Password Of This Quiz");
					document.quizpwdForm.pquiz_pwd.focus();
					return false;
					}
					if(quizpwd != quiz_correcr_pwd)
					{
					alert("Incorrect Password, Please Try Again");
					document.quizpwdForm.pquiz_pwd.select();
					return false;
					}					
				}
				if(quiz_required_id == 1)
				{
					var required_id = trim(document.getElementById("p_required_id").value);
					if(required_id ==''){
					alert("Please Enter Your ID");
					document.getElementById("p_required_id").value = '';
					document.quizpwdForm.required_id.focus();
					return false;
					}
				}
				if(quiz_required_email == 1)
				{
					var required_email = trim(document.getElementById("p_required_email").value);
					if ((required_email==null)||(required_email=="")){
					alert("Please Enter Your Email ID")
					document.quizpwdForm.required_email.focus();
					return false;
					}
					
					if (echeck(required_email)==false){
					document.quizpwdForm.required_email.select();
					return false;
					}				
				}
				return true;
       }
/*proprofscc: code ends */