//function to check if the field is not left blank.
	function isInput(field){
		// True if val is whitespace only or empty.
		var re = /\S+/;
		return (re.test(field));
	}
	
//function to check if the entered value is numeric or not
function IsNumeric(sText) {
			var ValidChars = "0123456789.";
			var IsNumber=true;
			var Char;

			for (i = 0; i < sText.length && IsNumber == true; i++) { 
				Char = sText.charAt(i); 
					if (ValidChars.indexOf(Char) == -1) 
						IsNumber = false;
			}
			
			return IsNumber;
	   }

//function to Check the values of Checkboxes
function CheckboxCheck(qVal,whatName)
	{
		var numSelected = 0;
		var i;
				
		for (i = 0;  i < (qVal.length);  i++)
		{
			if (qVal[i].checked)
			numSelected++;
		}
		if (numSelected > 3)
		{
			alert("Please select at most 3 options for " + whatName + " .");
			return false;
		}
		if (numSelected < 1)
		{	
			alert("Please select at least 1 option for " + whatName + " .");
			return false;
		}
	  return true;
	 }

//function to check the values for Radio buttons
function RadioCheck(qVal,whatName)
	{
		var numSelected = 0;
		var i;
				
		for (i = 0;  i < (qVal.length);  i++)
		{
			if (qVal[i].checked)
			numSelected++;
		}
		if (numSelected < 1)
		{
			alert("Please select an option for " + whatName + " .");
			return false;
		}
	  return true;
	 }

//function to check valid email address
function emailCheck (emailStr) {
		var checkTLD=1;
		var knownDomsPat=/^(com|net|org|edu|int|mil|gov|arpa|biz|aero|name|coop|info|pro|museum)$/;
		var emailPat=/^(.+)@(.+)$/;
		var specialChars="\\(\\)><@,;:\\\\\\\"\\.\\[\\]";
		var validChars="\[^\\s" + specialChars + "\]";
		var quotedUser="(\"[^\"]*\")";
		var ipDomainPat=/^\[(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})\]$/;
		var atom=validChars + '+';
		var word="(" + atom + "|" + quotedUser + ")";
		var userPat=new RegExp("^" + word + "(\\." + word + ")*$");
		var domainPat=new RegExp("^" + atom + "(\\." + atom +")*$");
		var matchArray=emailStr.match(emailPat);

		if (matchArray==null) {
			alert("Email address seems incorrect (check @ and .'s)");
			return false;
		}
		var user=matchArray[1];
		var domain=matchArray[2];
		for (i=0; i<user.length; i++) {
			if (user.charCodeAt(i)>127) {
				alert("Ths username contains invalid characters.");
				return false;
			}
		}
		for (i=0; i<domain.length; i++) {
			if (domain.charCodeAt(i)>127) {
				alert("Ths domain name contains invalid characters.");
				return false;
		    }
		}

		if (user.match(userPat)==null) {
			alert("The username doesn't seem to be valid.");
			return false;
		}

		var IPArray=domain.match(ipDomainPat);
			if (IPArray!=null) {
				for (var i=1;i<=4;i++) {
					if (IPArray[i]>255) {
						alert("Destination IP address is invalid!");
						return false;
				    }
				}
				return true;
			}

		var atomPat=new RegExp("^" + atom + "$");
		var domArr=domain.split(".");
		var len=domArr.length;
		for (i=0;i<len;i++) {
			if (domArr[i].search(atomPat)==-1) {
				alert("The domain name does not seem to be valid.");
				return false;
			}
		}

		if (checkTLD && domArr[domArr.length-1].length!=2 && 
			domArr[domArr.length-1].search(knownDomsPat)==-1) {
				alert("The address must end in a well-known domain or two letter " + "country.");
				return false;
			}
		if (len<2) {
			alert("This address is missing a hostname!");
			return false;
		}
	return true;
	}