var oRequest = new XMLHttpRequest();
  var sURL  = "tagcloud.xml";
  oRequest.open("GET",sURL,false);
  oRequest.setRequestHeader("User-Agent",navigator.userAgent);
  oRequest.send(null)
// if (oRequest.status==200) alert(oRequest.responseText);
// else alert("Error executing XMLHttpRequest call!");

  var flashvars = { mode: "tags", distr: "true", tcolor: "0x561de3", hicolor: "0x000000", xmlpath: "tagcloud.xml", tagcloud: oRequest.responseText };
  var params = { wmode: "transparent", allowscriptaccess: "always" };
  var attributes = {};
  swfobject.embedSWF("tagcloud.swf", "flashcontent", "375", "228", "7", "expressInstall.swf", flashvars, params, attributes );