// JavaScript Document
window.onload=function() {
	var elForm=document.getElementById('email_form');
	elForm.onsubmit=function() {
		var required=['EMail'];
		var requiredN=['E-Mail Address'];
		var bool=true;
		for(var i=0;i<required.length;i++) {
			if(document.getElementsByName(required[i])[0].value=='') {
				alert(requiredN[i]+' field is mandatory.');
				bool=false;
			} else {
				bool=echeck(document.getElementsByName('EMail')[0].value);
			}
		}
	return bool;
	}
}
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 Address")
		  return false
	}
	if (str.indexOf(at)==-1 || str.indexOf(at)==0 || str.indexOf(at)==lstr){
		alert("Invalid E-Mail Address")
		return false
	}
	if (str.indexOf(dot)==-1 || str.indexOf(dot)==0 || str.indexOf(dot)==lstr){
		alert("Invalid E-Mail Address")
		return false
	}
	if (str.indexOf(at,(lat+1))!=-1){
		alert("Invalid E-Mail Address")
		return false
	}
	if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		alert("Invalid E-Mail Address")
		return false
	}
	if (str.indexOf(dot,(lat+2))==-1){
		alert("Invalid E-Mail Address")
		 return false
	}
	if (str.indexOf(" ")!=-1){
		alert("Invalid E-Mail Address")
		return false
	}
 	return true					
}