// JavaScript Document
/*
<form name="frmSample" method="post" action="#" onSubmit="return ValidateForm()">
	<p>Enter an Email Address : 
	  <input type="text" name="txtEmail">
	</p>
	<p> 
	  <input type="submit" name="Submit" value="Submit">
	</p>
  </form>
*/
 
/**
 * DHTML email validation script. Courtesy of SmartWebby.com (http://www.smartwebby.com/dhtml/)
 */

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")
		   return false
		}

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

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

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

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

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

 		 return true					
	}

function ValidateForm(){
	var email=document.forms[0].email
	
	if ((email.value==null)||(email.value=="")){
		alert("Please Enter your Email")
		email.focus()
		return false
	}
	if (echeck(email.value)==false){
		email.value=""
		email.focus()
		return false
	}
	return true
 }