delete(http_request); 
    issueAJAXRequest: function(method, url, parameters, callback) {      method = method.toUpperCase(); // force method to uppercase for comparison      var alertContents = function() {        if (http_request.readyState == 4) {          if (http_request.status == 200) {            RSF.log("AJAX request success status: " + http_request.status);            callback.success(http_request);            RSF.log("AJAX callback concluded");            }           else {            RSF.log("AJAX request error status: " + http_request.status);            }          }        }      var http_request = false;      if (window.XMLHttpRequest) { // Mozilla, Safari,...        http_request = new XMLHttpRequest();        if (method == "POST" && http_request.overrideMimeType) {           // set type accordingly to anticipated content type            //http_request.overrideMimeType('text/xml');          http_request.overrideMimeType('text/xml');          }        }         else if (window.ActiveXObject) { // IE          try {            http_request = new ActiveXObject("Msxml2.XMLHTTP");            }           catch (e) {            try {               http_request = new ActiveXObject("Microsoft.XMLHTTP");            } catch (e) {}          }        }         if (!http_request) {           RSF.log('Cannot create XMLHTTP instance');           return false;         }                  http_request.onreadystatechange = alertContents;         if (method == "GET") {            url = url + "?" + parameters;         }         http_request.open(method, url, true);         if (method == "GET") {            http_request.send(null);         } else { // assume POST            http_request.setRequestHeader("Content-type", "application/x-www-form-urlencoded");            http_request.setRequestHeader("Content-length", parameters.length);            http_request.setRequestHeader("Connection", "close");            http_request.send(parameters);         }         delete(http_request); // clear the http object         return true; // true if sent to the server      },
7245	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/7245/846bdaf024c274e717ffeeb78e364de1c310a003/rsf.js/buggy/templates/src/webapp/content/js/rsf.js