function useravailable(request)
{
    document.getElementById("user_available").style.display = "none";
    document.getElementById("user_not_available").style.display = "none";
    document.getElementById("enter_name").style.display = "none";
    document.getElementById('username_errmsg').style.display = "none";
    //document.getElementById('user_available').style.display = "none";
	if( request.responseText == "NotFound" )
	{
	   // alert(document.getElementById("user_available").innerHTML;
	    document.getElementById("user_available").style.display = "block";
	}
	else if(request.responseText == "NoName")
	{
	   document.getElementById("enter_name").style.display = "block";
	}
	else 
	    document.getElementById("user_not_available").style.display = "block";
}