function layerSetup(id,visibility) {
	if(document.getElementById) {
		this.obj = document.getElementById(id).style;
		this.obj.visibility = visibility;
		return this.obj;
	}
	else if(document.all) {
		this.obj = document.all[id].style;
		this.obj.visibility = visibility;
		return this.obj;
	}
	else if(document.layers) {
		this.obj = document.layers[id];
		this.obj.visibility = visibility;
		return this.obj;
	}
}

function visVisible(param) {
	new layerSetup(param,'visible');
}

function visHidden(param){
	new layerSetup(param,'hidden');
}

function MM_swapImgRestore() { //v3.0
	var i,x,a=document.MM_sr; 
	for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
	var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
	var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
	if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
	var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
	d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
	if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
	for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
	if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
	var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
	if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}

function IsvalidEmail(mailid) {		
	var strValue=mailid;
	//var objRegExp  = /(^[a-z]([a-z_\.]*)@([a-z_\.]*)([.][a-z]{3})$)|(^[a-z]([a-z_\.]*)@([a-z_\.]*)(\.[a-z]{3})(\.[a-z]{2})*$)/i;
	var objRegExp  = /^[\w-\.]+@([\w-]+\.)+[\w-]{2,6}$/;

	return objRegExp.test(strValue);

}

function Trim(s) {
	while ((s.substring(0,1) == ' ') || (s.substring(0,1) == '\n') || (s.substring(0,1) == '\r')) {
		s = s.substring(1,s.length);
	}
	
	while ((s.substring(s.length-1,s.length) == ' ') || (s.substring(s.length-1,s.length) == '\n') || (s.substring(s.length-1,s.length) == '\r')) {
		s = s.substring(0,s.length-1);
	}
	return s;
}

function IsNumeric(strString) {
	var objRegExp  =  /(^-?\d\d*\.\d*$)|(^-?\d\d*$)|(^-?\.\d\d*$)/;
	return objRegExp.test(strValue);
}
function IsPhone(strString) {
	//var objRegExp  =  /^[0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5]++/;	
	var objRegExp = /^(\+\d)*\s*(\(\d{3}\)\s*)*\d{3}(-{0,1}|\s{0,1})\d{2}(-{0,1}|\s{0,1})\d{2}$/;
	return objRegExp.test(strValue);
}
function IsNum(strString) {
	var objRegExp  =  /^[0-9]*$/;
	return objRegExp.test(strValue);
}


function validateform(evt) {
	if (evt.keyCode == 13) {
		submitform();
	}
}

function validUrl(url)                                 // Link Tracker : To check whether URL is Valid OR Not
{
  var i;
  var result=1;
  var urlPart;
  var urlCheck=url;
 
  if(urlCheck.length<5)
	 result=2;

  urlPart=urlCheck.split(":");

  if(urlPart[0]=="http" || urlPart[0]=="https")
	{
	 
	  urlPart=urlPart[1].split(".");
	 if((urlPart[urlPart.length-1].length < 2) || urlPart.length < 2)//|| (urlPart[urlPart.length-2].length < 2)
		  result=2;
      else
		  result=1;
	}
  else
	{
	  result=2;
	}

	if(result==2)
		return false;
	else 
	 {
		return true;
 	 }
 }

function formvalidate(array_fields,array_message) {
	var alertfields="";
	var setfocus="";
	var i;
	for(i = 0; i < array_fields.length; i++) {
		if(Trim(document.getElementById(array_fields[i]).value) == "") {
			alertfields+="- " + array_message[i] + "\n";
			if (setfocus=="") {
				 setfocus=array_fields[i];
			}
		}
	}
	if(alertfields != "") {
		alert("The following field(s) cannot be left blank:\n\n"+alertfields+"\nPlease fill these fields.");
		document.getElementById(setfocus).focus();
		return false;		
	}
	return true;
}

var digits = "0123456789";
var phoneNumberDelimiters = "()- ";
var validWorldPhoneChars = phoneNumberDelimiters + "+";
var minDigitsInIPhoneNumber = 10;
var minDigitsInIPhoneNumber1 = 5;

function isInteger(s) {
	var i;
    for (i = 0; i < s.length; i++) {   
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    return true;
}

function stripCharsInBag(s, bag) {   
	var i;
    var returnString = "";
    for (i = 0; i < s.length; i++) {   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

function checkInternationalPhone(strPhone){
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber);
}
function checkInternationalPhone1(strPhone){
	s=stripCharsInBag(strPhone,validWorldPhoneChars);
	return (isInteger(s) && s.length >= minDigitsInIPhoneNumber1);
}
function textCounter(field,cntfield,maxlimit) {
	if (field.value.length > maxlimit) // if too long...trim it!
		field.value = field.value.substring(0, maxlimit);
	// otherwise, update 'characters left' counter
	else
		cntfield.value = maxlimit - field.value.length;
}
function exercise_vlidation(frm_exercise){
	var input=document.getElementsByTagName('input');
	var totalQuest=0;
	for(var i=0;i<input.length;i++) {
		if(input[i].type=='hidden')
			totalQuest=totalQuest+1;
	}	

	var tot=totalQuest-4;
	var answer='';	
	for(var n=0;n<tot;n++) {
		var k=0;
		var a=5;			
		if(document.getElementById('qus_ans['+n+']['+a+']')!=null) {
			if(document.getElementById('qus_ans['+n+']['+a+']').value){	
				k=1;
			}
		} else {
			for(j=1;j<=4;j++) {
				if(document.getElementById('qus_ans['+n+']['+j+']')!=null) {
					if((document.getElementById('qus_ans['+n+']['+j+']').checked)) {
						k=1;
					}
				}
			}	
		}			
		if(k == 0){
			answer= answer +  (n+1) + ',';
		}		
	 }		
	 if(answer!='' && answer!=null){
		 alert("Please answer the Following Questions:"+answer); 
		 return false;
	 } 
}


/**
 * DHTML date validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */
// Declaring valid date character, minimum year and maximum year
var dtCh= "/";
var minYear=1900;
var maxYear=2100;

function daysInFebruary (year){
	// February has 29 days in any year evenly divisible by four,
    // EXCEPT for centurial years which are not also divisible by 400.
    return (((year % 4 == 0) && ( (!(year % 100 == 0)) || (year % 400 == 0))) ? 29 : 28 );
}
function DaysArray(n) {
	for (var i = 1; i <= n; i++) {
		this[i] = 31
		if (i==4 || i==6 || i==9 || i==11) {this[i] = 30}
		if (i==2) {this[i] = 29}
   } 
   return this
}

function isDate(dtStr){
	var daysInMonth = DaysArray(12)
	var pos1=dtStr.indexOf(dtCh)
	var pos2=dtStr.indexOf(dtCh,pos1+1)
	var strMonth=dtStr.substring(0,pos1)
	var strDay=dtStr.substring(pos1+1,pos2)
	var strYear=dtStr.substring(pos2+1)
	strYr=strYear
	if (strDay.charAt(0)=="0" && strDay.length>1) strDay=strDay.substring(1)
	if (strMonth.charAt(0)=="0" && strMonth.length>1) strMonth=strMonth.substring(1)
	for (var i = 1; i <= 3; i++) {
		if (strYr.charAt(0)=="0" && strYr.length>1) strYr=strYr.substring(1)
	}
	month=parseInt(strMonth)
	day=parseInt(strDay)
	year=parseInt(strYr)
	if (pos1==-1 || pos2==-1){
	//	alert("The date format should be : mm/dd/yyyy")
		return false
	}
	if (strMonth.length<1 || month<1 || month>12){
		//	alert("Please enter a valid month")
		return false
	}
	if (strDay.length<1 || day<1 || day>31 || (month==2 && day>daysInFebruary(year)) || day > daysInMonth[month]){
		// alert("Please enter a valid day")
		return false
	}
	if (strYear.length != 4 || year==0 || year<minYear || year>maxYear){
		// alert("Please enter a valid 4 digit year between "+minYear+" and "+maxYear)
		return false
	}
	if (dtStr.indexOf(dtCh,pos2+1)!=-1 || isInteger(stripCharsInBag(dtStr, dtCh))==false){
	 	//	alert("Please enter a valid date")
		return false
	}
return true
}


function IsValidTime(timeStr) {
	var strValue=timeStr;
	var objRegExp  = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;
	return objRegExp.test(strValue);
} /*

// Checks if time is in HH:MM:SS AM/PM format.
// The seconds and AM/PM are optional.

var timePat = /^(\d{1,2}):(\d{2})(:(\d{2}))?(\s?(AM|am|PM|pm))?$/;

var matchArray = timeStr.match(timePat);
if (matchArray == null) {
// alert("Time is not in a valid format.");
return false;
}
hour = matchArray[1];
minute = matchArray[2];
second = matchArray[4];
ampm = matchArray[6];

if (second=="") { second = null; }
if (ampm=="") { ampm = null }

if (hour < 0  || hour > 23) {
// alert("Hour must be between 1 and 12. (or 0 and 23 for military time)");
return false;
}
/*if (hour <= 12 && ampm == null) {
if (confirm("Please indicate which time format you are using.  OK = Standard Time, CANCEL = Military Time")) {
alert("You must specify AM or PM.");
return false;
   }
}
if  (hour > 12 && ampm != null) {
// alert("You can't specify AM or PM for military time.");
return false;
}
if (minute<0 || minute > 59) {
// alert ("Minute must be between 0 and 59.");
return false;
}
if (second != null && (second < 0 || second > 59)) {
// alert ("Second must be between 0 and 59.");
return false;
}
return false;
}*/





function assignment_vlidation(frm_assign){
	var testarea =document.getElementsByTagName('textarea');
	var str='';
	for(i=1;i<=testarea.length;i++){
		var fieldname = "txt_answer"+i;
		if((document.getElementById(fieldname).value)==""){
			str +="Assignment"+i+".\n";
		}
	}
	if (str!="") {
		msg="Please enter the Answer of the following\n";
		msg =msg + "------------------------------------------------------\n";
		msg =msg + str;
		alert(msg);
		return false;
	} else {
		return true;
	}
}