var sessionIdInfix = "";

    var http_request = false;

    function executeRequest(url, callbackFunction) {
	    var date = new Date();
    	if (url.indexOf("?")>-1) {
    		url += "&";
    	} else {
    		url += "?";
    	}
    	url += "clientTime="+date.getTime();
    	
        http_request = false;
        if (window.XMLHttpRequest) { // Mozilla, Safari,...
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                http_request.overrideMimeType('text/xml');
            }
        } else if (window.ActiveXObject) { // IE
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP.3.0");
            } catch (e) {
	            try {
	                http_request = new ActiveXObject("Msxml2.XMLHTTP");
	            } catch (f) {
	                try {
	                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
	                } catch (g) {}
	            }
            }
        }
        
 
        if (!http_request) {
            alert('Error: Cannot create XMLHttpRequest instance');
            return false;
        }
        http_request.onreadystatechange = callbackFunction;
        http_request.open('GET', url, true);
        http_request.send(null);
    }