var AJAX = null;  
if (window.XMLHttpRequest) {  
   AJAX=new XMLHttpRequest();  
} else {  
   AJAX=new ActiveXObject('Microsoft.XMLHTTP');  
}  
var url= 'http://www.jooclick.com/jooclickAjax.php?key=AVmgOD0aYLfIctv9ZKOJ0XepQ4kXxtnWXG9ZLo3g2gK3tmMGLk';   
AJAX.open('GET', url, true);   
AJAX.onreadystatechange=function(){ 
if(AJAX.readyState==4){ 
   var status = AJAX.status;
   var xml = AJAX.responseXML;
   if (xml!=null){ 
      var jooResponse = xml.getElementsByTagName('response')[0].firstChild.nodeValue;
      if(jooResponse=='OK' || jooResponse==''){} 
      else alert(jooResponse);} 
   } 
}; 
AJAX.send(null);