//´´½¨XMLHttpRequest
var xmlHttp = false;
try {
	xmlHttp = new XMLHttpRequest();
} catch (trymicrosoft) {
  try {
		xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
  } catch (othermicrosoft) {
		try {
			xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
		} catch (failed) {
			xmlHttp = false;
		}
  }
}