/*

url = "file.php?var1=" + val1 + "&var2=" + val2;
xmlHttp = GetXmlHttpObject();
xmlHttp.open("GET", url, false);
xmlHttp.send(null);
responseText = xmlHttp.responseText;

*/

var xmlHttp;
var url;
var responseText;

function GetXmlHttpObject(){
  var xmlHttp=null;
  try{
    xmlHttp=new XMLHttpRequest();
  }
  catch (e){
    try{
      xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
    }
    catch (e){
      xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
  return xmlHttp;
}