var httpRequest = false;
if (window.ActiveXObject)
 {
 httpRequest = new ActiveXObject('Microsoft.XMLHTTP'); 
 } 
 else 
{
 httpRequest = new XMLHttpRequest();
 httpRequest.overrideMimeType('text/xml'); 
 } 
 httpRequest.open('POST', 'CreateDownloadJS.aspx', false); 
 httpRequest.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');  
 httpRequest.send('');