// JavaScript Document
var xmlHttp;
//---------------------------------------------------------------------------
function showHint(str){
	if(str=="FName"){element = document.frm.txtFName.value; }
	else if(str=="regNum"){element = document.frm.txtURegNum.value; }
	else if(str=="Email"){element = document.frm.txtEmail.value; }
	else if(str=="UName"){element = document.frm.txtUserName.value; }
	if (element.length==0 || element==""){ 
		document.getElementById(str).innerHTML="";
	  	return;
	  }
	xmlHttp=GetXmlHttpObject();
	if (xmlHttp==null){
	  alert ("Browser does not support HTTP Request");
	  return;
	  } 
	var url="chkfield.php";
	url=url+"?ee="+str;
	url=url+"&vv=" + element;
	xmlHttp.onreadystatechange=stateChanged;
	xmlHttp.open("POST",url,true);
	xmlHttp.send(null);
} 
//----------------------------------------------------------------------------
function stateChanged() 
{ 
if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete")
 {
	 if(xmlHttp.responseText=="10"){
		document.getElementById("FName").innerHTML = "<img src='tick.png' />";
		document.frm.errName.value = "true";
	 }
	 else if(xmlHttp.responseText=="11"){
		document.getElementById("FName").innerHTML = "<img src='err.png' alt='You are already registered.'><div class='err'>You are already registered.</div>";
		document.frm.errName.value = "false";
	 }
	 else if(xmlHttp.responseText=="20"){
		 document.getElementById("regNum").innerHTML = "<img src='tick.png' />";
		 document.frm.errRegNum.value = "true";
	 }
	 else if(xmlHttp.responseText=="21"){
		 document.getElementById("regNum").innerHTML = "<img src='err.png' alt='You are already registered.'><div class='err'>You are already registered.</div>";
		 document.frm.errRegNum.value = "false";
	 }
	 else if(xmlHttp.responseText=="30"){
		 document.getElementById("Email").innerHTML = "<img src='tick.png' />";
		 document.frm.errEmail.value = "true";
	 }
	 else if(xmlHttp.responseText=="31"){
		 document.getElementById("Email").innerHTML = "<img src='err.png' alt='Invalid E-mail address.'><div class='err'>Invalid E-mail address.</div>";
		 document.frm.errEmail.value = "false";
	 }
	 else if(xmlHttp.responseText=="40"){
		 document.getElementById("UName").innerHTML = "<img src='tick.png' />";
		 document.frm.errUName.value = "true";
	 }
	 else if(xmlHttp.responseText=="41"){
		 document.getElementById("UName").innerHTML = "<img src='err.png' alt='The User Name is not available.'><div class='err'>The User Name is not available.</div>";
		 document.frm.errUName.value = "false";
	 }
 } 
}

//-----------------------------------------------------------------------------
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;
}