function getXmlHttpObject() {
  var xmlHttp = null;
  try {
    // Firefox, Opera 8.0+, Safari, IE7
    xmlHttp = new XMLHttpRequest();
  } catch (e) {
    // IE6, IE5.x
    try {
      xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
    }
  }
  return xmlHttp;
}

function addOnLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
		func();
		oldonload();
    }
  }
}