var request = null;

try{
	request = new XMLHttpRequest();
}catch(trymicrosoft){
	try{
		request = new ActiveXObject("Mszml2.XMLHTTP");
	}catch(othermicrosoft){
		try{
			request = new ActiveXObject("Microsoft.XMLHTTP");
		}catch(failed){
			request = null;
		}
	}
}
if(request == null)
	alert("Error creating request object!");