// TRIM FUNCTION => START 
			function LTrim(String)
			{
				var i = 0;
				var j = String.length - 1;
			
				if (String == null)
					return (false);
			
				for (i = 0; i < String.length; i++)
				{
					if (String.substr(i, 1) != ' ' &&
						String.substr(i, 1) != '\t')
						break;
				}
			
				if (i <= j)
					return (String.substr(i, (j+1)-i));
				else
					return ('');
			}
			
			function RTrim(String)
			{
				var i = 0;
				var j = String.length - 1;
			
				if (String == null)
					return (false);
			
				for(j = String.length - 1; j >= 0; j--)
				{
					if (String.substr(j, 1) != ' ' &&
						String.substr(j, 1) != '\t')
					break;
				}
			
				if (i <= j)
					return (String.substr(i, (j+1)-i));
				else
					return ('');
			}
			
			function Trim(String)
			{
				if (String == null)
					return (false);
			
				return RTrim(LTrim(String));
			}
	
			

// TRIM FUNCTION => END 


//<!-- INTEGER NUMBERS ONLY => START //-->
function allowNumbers()
{
if (event.keyCode >= 48 && event.keyCode <= 57 ) 
  event.returnValue = true;
else
  event.returnValue = false;
}
//<!-- INTEGER NUMBERS ONLY => END //-->


<!-- EMAIL CHEAKER  => START //-->
	var good;
	function checkEmailAddress(field) 
{
	
	if(field.value!="")
	{
		// Note: The next expression must be all on one line...
		//       allow no spaces, linefeeds, or carriage returns!
		var goodEmail = field.value.match(/\b(^(\S+@).+((\.com)|(\.in)|(\.net)|(\.edu)|(\.mil)|(\.gov)|(\.org)|(\..{2,2}))$)\b/gi);
		if (!goodEmail)
		{
		   alert('Please enter a valid E-Mail address.');
		   field.focus();
		   field.select();
		   good = false;
		 }
	}
}
<!-- EMAIL CHEAKER  => END //-->


// DATE VALIDATION => START  
/**
 * DHTML date validation script for dd/mm/yyyy. 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 isInteger(s){
	var i;
    for (i = 0; i < s.length; i++){   
        // Check that current character is number.
        var c = s.charAt(i);
        if (((c < "0") || (c > "9"))) return false;
    }
    // All characters are numbers.
    return true;
}

function stripCharsInBag(s, bag){
	var i;
    var returnString = "";
    // Search through string's characters one by one.
    // If character is not in bag, append to returnString.
    for (i = 0; i < s.length; i++){   
        var c = s.charAt(i);
        if (bag.indexOf(c) == -1) returnString += c;
    }
    return returnString;
}

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 strDay=dtStr.substring(0,pos1)
	var strMonth=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 : dd/mm/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 ValidateDate(objDate){

//alert(objDate.id);
	var dt=document.getElementById(objDate.id).value;
	
	if(dt!="")
	{
		if (isDate(dt)==false){
			document.getElementById(objDate.id).style.backgroundColor='lightgoldenrodyellow'
			document.getElementById(objDate.id).focus()
			return false
		}
		//alert(document.getElementById(objDate.id).value);

	var CompDate=document.getElementById(objDate.id).value;
	var FirstSlashPos=CompDate.indexOf("/");
	var SecondSlashPos=CompDate.indexOf("/",FirstSlashPos+1);
	var Yer=CompDate.substring(SecondSlashPos+1)

	var NewMonth=CompDate.substring(FirstSlashPos+1,SecondSlashPos)
	
	if(FirstSlashPos==1)
	{
		var NewDay=CompDate.substring(0,FirstSlashPos)
		NewDay="0"+NewDay;
		//alert(NewDay);
		//return false;
	}
	else
	{
		var NewDay=CompDate.substring(0,FirstSlashPos)
	}
	
	if(NewMonth.length ==1)
	{
		NewMonth="0"+NewMonth;
		//alert(NewMonth);
	}

	document.getElementById(objDate.id).value=NewDay+"/"+NewMonth+"/"+Yer;

		return true
	}
 }

// DATE VALIDATION => END