function pullAjax(){
	var a;
	try{
	  a=new XMLHttpRequest()
	}
	catch(b)
	{
	  try
	  {
	    a=new ActiveXObject("Msxml2.XMLHTTP")
	  }catch(b)
	  {
	    try
	    {
	      a=new ActiveXObject("Microsoft.XMLHTTP")
	    }
	    catch(b)
	    {
	      alert("Your browser broke!");return false
	    }
	  }
	}
	return a;
}
 
function validate()
  {
    site_root = '';
    var x = document.getElementById('username');
    var msg = document.getElementById('checkstatus');
    user = x.value;
 
    code = '';
    message = '';
    obj=pullAjax();
    obj.onreadystatechange=function()
    {
      if(obj.readyState==4)
      {
        eval("result = "+obj.responseText);
        code = result['code'];
        message = result['result'];
 
        if(code <=0)
        {
          x.style.border = "1px solid red";
          msg.style.color = "red";
        }
        else
        {
          x.style.border = "1px solid #000";
          msg.style.color = "green";
        }
        msg.innerHTML = message;
      }
    }
    obj.open("GET",site_root+"validate.php?username="+user,true);
    obj.send(null);
}