var req;

function loadXMLDoc(url) 
{
	// branch for native XMLHttpRequest object
    if (window.XMLHttpRequest) {
    	req = new XMLHttpRequest();
        req.onreadystatechange = processReqChange;
        req.open("GET", url, true);
		req.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
        req.send(null);
	
    // branch for IE/Windows ActiveX version
    } else if (window.ActiveXObject) {
    	req = new ActiveXObject("Microsoft.XMLHTTP");
        if (req){
        	req.onreadystatechange = processReqChange;
			req.open("GET", url, true);
			req.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
			req.send();									
        }
    }
}