jquery javascript and jsonp probelm with xml result

i need to make a request to a dedicate website , using jsonp for cross domain reason to get back a xml result and work on it so basicly i m doing this to start :

(function($) {
var url = 'http://www.website.....';
$.ajax({
   type: 'GET',
    url: url,
   // async: false,
   // contentType: "application/json",
dataType: 'jsonp',
});
})(jQuery);

i can finally get an answer from website, that i can see in the firebug plugin but in xml tab such as :

<Results xmlns:xsi="http://ift.tt/ra1lAU"     xsi:noNamespaceSchemaLocation="http://www.website.com">
<ResultSet id="searchResults" numResults="3" >

etc...

from my understanding jsonp is a json object and in my case it s returning a xml content.

my problem is how to manage the xml return from the website so i can parse it and play with in the javascript code,

thanks for this