function ajax_get(ctnid) { 
        if (ua.indexOf('msie') != -1) { 
                ajax_get_request = new ActiveXObject("Msxml2.XMLHTTP"); 
        } else { 
                ajax_get_request = new XMLHttpRequest(); 
        } 
        ajax_get_request.onreadystatechange = function ajax_get_xml() { 
                if (ajax_get_request.readyState == 4) { 
                        if (ajax_get_request.status == 200) { 
                                var number_of_items = ajax_get_request.responseXML.getElementsByTagName("item").length; 
                                var item_id = ajax_get_request.responseXML.getElementsByTagName("id"); 
                                if (number_of_ajax > 0) {                                       
                                        for (var i=0; i < number_of_items; i++) { 
                                                // do something 
                                        }                                                       
                                } else { 
                                        // do something 
                                }                                               
                        } else { 
                                alert("There was an error while retrieving the URL: " + ajax_get_request.statusText); 
                        } 
                } 
                return true;                                    
        } 
        ajax_get_request.open("POST", "/path/to/your/php/script", true); 
        ajax_get_request.setRequestHeader('Content-Type','application/x-www-form-urlencoded'); 
        //ctnid is a variable that is being passed    
        ajax_get_request.send("ctnid="+ctnid);                          
} 


Your php script would need to return a valid XML document.  In the example, something like: 


<items> 
   <item> 
      <id>1</id> 
   </item> 
   <item> 
      <id>2</id> 
   </item> 
</items> 

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