//Browser Support Code
function ajax2Function(){

	var ajaxRequest;  // The variable that makes Ajax possible!
	
	try{
		// Opera 8.0+, Firefox, Safari
		ajaxRequest = new XMLHttpRequest();
	} catch (e){
		// Internet Explorer Browsers
		try{
			ajaxRequest = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try{
				ajaxRequest = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e){
				// Something went wrong
				alert("Your browser broke!");
				return false;
			}
		}
	}
	// Create a function that will receive data sent from the server
	ajaxRequest.onreadystatechange = function(){
		if(ajaxRequest.readyState == 4){
			
			if(ajaxRequest.responseText=="0"){
					alert("Username Not Found");
					parent.document.getElementById("error2").setAttribute("style", "display:block")
			}
				
		}
	}

	var qstring = "?username=" + parent.document.getElementById("username").value;
	
	
	ajaxRequest.open("GET", "DoubleUser.php"+ qstring, true);
	ajaxRequest.send(null); 
	
	
}