[Nekromancer]

ну капец.. чего сложного..

function httpRequest(){
	try{
		return new window.ActiveXObject("Microsoft.XMLHTTP");
	}catch(e){
		return new window.XMLHttpRequest();
	}
};
var request = httpRequest();
request.open('GET', 'file.php', true);
request.onreadystatechange = function(){
	if(/4|complete|loaded/.test(request.readyState)){
		if(request.status==200){
			var response = eval(request.responseText);
		}else{
			//...
		}
	}
}
request.send(null)