Neither:
var response = $.ajax({ type: \"GET\", url: \"http://www.google.de\", async: false, success : function() { alert (this
The only way that I know that enables you to use ajax cross-domain is JSONP (http://ajaxian.com/archives/jsonp-json-with-padding).
And here's a post that posts some various techniques to achieve cross-domain ajax (http://usejquery.com/posts/9/the-jquery-cross-domain-ajax-guide)