function emailCheck(s)
{
	if(!(s.match(/^[\w]+([_|\.-][\w]{1,})*@[\w]{2,}([_|\.-][\w]{1,})*\.([a-z]{2,4})$/i) ))
    {
		alert("Please Enter Valid Email Address");
		return false;
	}
	else
	{
		return true;
	}	
}


function Trim(str)
{  while(str.charAt(0) == (" ") )
  {  str = str.substring(1);
  }
  while(str.charAt(str.length-1) == " " )
  {  str = str.substring(0,str.length-1);
  }
  return str;
}


function temp()
	{
		var browser=navigator.appName;

		if (browser == "Netscape")
		{
			return "table-row";
		}
		else
		{
			return "block";
		}
	}




<!-- TWO STEPS TO INSTALL TIME VALIDATION:

//  1.  Copy the coding into the HEAD of your HTML document
//  2.  Add the last code into the BODY of your HTML document  -->

<!-- STEP ONE: Paste this code into the HEAD of your HTML document  -->

<!-- Original:  Sandeep Tamhankar (stamhankar@hotmail.com) -->
<!-- Web Site:  http://207.20.242.93 -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
function IsValidTime(timeStr) {
// 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;
}
//  End -->

/**
 * 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 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 emailCheck1(s)
{
	if(!(s.match(/^[\w]+([_|\.-][\w]{1,})*@[\w]{2,}([_|\.-][\w]{1,})*\.([a-z]{2,4})$/i) ))
    {
//		alert("Please Enter Valid Email Address");
		return false;
	}
	else
	{
		return true;
	}	
}


function del_confirm(msg,url)
{
	if (confirm(msg))
	{
		window.location.href=url;
	}
}


//................To select-deselect all check box..............................

function chkall()
{
//	if (parseInt(document.frm.num.value) > 0)
//	{
		len = document.frm.allid.length;
		if(typeof(len)!='number')
		{
			if(document.frm.chk_all.checked == true)
			{
					document.frm.allid.checked = true;
			}		
			else
			{
					document.frm.allid.checked = false;		
			}
		}
		else
		{
			if(document.frm.chk_all.checked == true)
			{
				for(i=0; i<len; i++)
				{
					document.frm.allid[i].checked = true;
				}			
			}
			else
			{
				for(i=0; i<len; i++)
				{
					document.frm.allid[i].checked = false;
				}				
			}
		}	
//	}
}


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;
}
//................For Float checking....................
function isFloat(s)
{   var i;
	tmp = 0;
	flag = 0;
    for (i = 0; i < s.length; i++)
    {   
        // Check that current character is number.
        var c = s.charAt(i);
		if (((c >= "0" && c <= "9") || (c == ".")))
		{
			if (c == ".")
			{
				flag++;
			}
			if (flag > 1)
			{
				tmp = 1;
				break;
			}
			//alert (flag);
		}
		else
		{
			tmp = 1; 
			break;
		}		
    }
	if (tmp == 1)
		return false;
	else
    	return true;
}




<!--For Capcha Code-->

function new_freecap()
{
	// loads new freeCap image
	if(document.getElementById)
	{
		// extract image name from image source (i.e. cut off ?randomness)
		thesrc = document.getElementById("freecap").src;
		thesrc = thesrc.substring(0,thesrc.lastIndexOf(".")+4);
		// add ?(random) to prevent browser/isp caching
		document.getElementById("freecap").src = thesrc+"?"+Math.round(Math.random()*100000);
	} else {
		alert("Sorry, cannot autoreload Cap image\nSubmit the form and a new Cap will be loaded");
	}
}