/**
* AJAX forms
* 
* Author : Hatem B.Y.
*/
var AJAXForms = false;
var LastField = null;
var isIE = false;
// on !IE we only have to initialize it once
if (window.XMLHttpRequest) {
	AJAXForms = new XMLHttpRequest();
}

function CheckField(field) {

try
{
AJAXForms = new ActiveXObject("Microsoft.XMLHTTP");
}
catch (error)
{
try
{
if (window.XMLHttpRequest) {
AJAXForms = new XMLHttpRequest();
}
}
catch (error)
{
return false;
}
}
AJAXForms.onreadystatechange = processChange;
AJAXForms.open("GET", "check.php?op=ajax&field=response&value=" + field.value);
LastField = "response";
AJAXForms.send(null);
}

function processChange() {
  if (AJAXForms.readyState == 4) { 
  
    var  res = document.getElementById(LastField);
    res.innerHTML = AJAXForms.responseText;
    res.style.visibility = "visible";
    
  }
}