function getXMLHTTPRequest() {
	    var req = false;
	    try{
		req = new XMLHttpRequest();
	    }catch(err1){
		try {
		  req = new ActiveXObject("Msxml2.XMLHTTP");
		}catch(err2){
		  try{
		      req = ActiveXObject("Microsoft.XMLHTTP");
		  }catch(err3){
		      req = false;
		  }
		}
	    
	    }
	    return req;
      }
      
      var http = getXMLHTTPRequest();