var msgs = new Array();
msgs[0] = "Your E-mail already exists";
msgs[1] = "Newsletter subscription successful";
msgs[2] = "Server Problem";
msgs[3] = "Invalid E-mail address";
msgs[4] = "your email address"; //ADDED BY SATHIYAN ON 15-12-2008

function changeTask() {
	var email = document.getElementById('email').value;
	var url = "letterman.php?mail="+email;
	var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i
	var obj = document.getElementById('email');
	var goObj = document.getElementById('go_but');
	if (filter.test(email)) {	
	
	var xmlHttp;
	try
	{
	// Firefox, Opera 8.0+, Safari
	xmlHttp=new XMLHttpRequest();
	}
	catch (e)
	{
	// Internet Explorer
	try
	{
	xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
	}
	catch (e)
	{x
	try
	  {
	  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
	  }
	catch (e)
	  {
	  alert("Your browser does not support AJAX!");
	  return false;
	  }
	}
	}
		xmlHttp.onreadystatechange=function()
		{
			
		if(xmlHttp.readyState!=4) {
			document.getElementById("divDisplayLetter1").style.display = "block";
			document.getElementById("divDisplayLetter2").style.display = "none";
			
			document.getElementById("divDisplayLetter1").innerHTML = "<img src='/images/progress.gif'>";
			
		}
		
		if(xmlHttp.readyState==4)
		  {      
  			document.getElementById("divDisplayLetter1").style.display = "none";
			document.getElementById("divDisplayLetter2").style.display = "block";
		  
		  if(xmlHttp.responseText==1) {
		  	alert(msgs[1]);	
			obj.value = msgs[4];
		  }  
 		  if(xmlHttp.responseText==2) {
		  	alert(msgs[0]);	
			obj.value = msgs[4];
		  }		  
		  
		  }
		}
	  xmlHttp.open("GET",url,true);
	  xmlHttp.send(null);


	}
	else{
		obj.style.backgroundImage='none';
		alert(msgs[3]);
		obj.focus();				
	}
	
	
}
function checkDefault(objt) {
	if(objt.value == '')
		objt.style.backgroundImage='';
			
}