[sashavorkov]

Может еще так

var test=function(){
	function s(p,f){
		return function(){f.apply(p,arguments)}
	};

	self.ajaxSend=function(){
		var req=new Request(url, self.callback);
		req.addVar("par1", 1);
		req.addVar("par2", "ыыыыыы");
		req.send();
	};
	self.callback= s(this,function(){console.log(self);});
};
var test1=new test();
test1.ajaxSend();