// JavaScript Document
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 ID")
			   return false
			}

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

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

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

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

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

 		 return true					
}

var xmlHttp 
function chk_username(url, displayitem) 
{	
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null) {	
		alert ("Your browser does not support AJAX!");
		return;
	} 
	url =url+"&sid="+Math.random();		
	xmlHttp.onreadystatechange=function stateChanged() {
		if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") {			
			if(xmlHttp.responseText.length>0) {			
				document.getElementById("txtHint").innerHTML=xmlHttp.responseText;							
				if (xmlHttp.responseText=="<font color=red>Username Already Exists.</font>") {			
					document.frmreg.user_name.focus();
					document.getElementById('txtHint').style.display = 'block'; 
					return false;
				}
			}
			else {
				document.getElementById("txtHint").innerHTML="";
				document.getElementById('txtHint').style.display = 'none'; 
			}
		}
	};
	
	xmlHttp.open("GET",url,true);
	xmlHttp.send(null);
}

function GetXmlHttpObject() {	
	var xmlHttp=null;
	try {
		// Firefox, Opera 8.0+, Safari
		xmlHttp=new XMLHttpRequest();
	}
	
	catch (e) {
		// Internet Explorer
		try {
			xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
		}
		catch (e) {
			xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
		}
	}
return xmlHttp;
}