function getXMLHttpRequest() {
  var xmlHttpRequest=null;
  try {
	if (window.XMLHttpRequest){
		// Firefox, Opera 8.0+, Safari, Internet Explorer 7
		xmlHttpRequest=new XMLHttpRequest();
	} else {
    // Other Internet Explorer
    xmlHttpRequest=new ActiveXObject("Microsoft.XMLHTTP");
	}
  } catch (e) {
	xmlHttpRequest=null;
  }

return xmlHttpRequest;
}