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function submitAssignForm(event,form){	var file = 'data.php';	var str = getFormValues(form,"validate");	xmlReq = getXML(file,str);	if (xmlReq){		alert(xmlReq);		var response = xmlReq.responseXML;	//	alert(response);		var response_details = response.getElementsByTagName('response');		alert(response_details.length);		if (response_details.length > 0){			alert(response_details[0].getAttribute('user_id'));			alert(response_details[0].getAttribute('purchase_id'));		}	}	if (window.event) window.event.returnValue = false;	else event.preventDefault();	return false;}function getXML(file,str){	var xhr = remoteRequestSetup();  	if (xhr){		xhr.onreadystatechange  = function(){ 			if(xhr.readyState  == 4){				if(xhr.status  == 200) {					alert('should be working');				//	return xhr;				}				else alert('Error code ' + xhr.status);			}		}; 	}	xhr.open( "POST", file, true );	xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded; charset=UTF-8");	xhr.send(str);	return xhr;}