[jQuery] click event and window.location problem in safari

[introvert]

Hello

I have a simple jquery code that will put a link (on click event) on a
division. The link is read from the anchor inside of the div:

$(document).ready(function() {
   $("div.picture").click(function () {
        var url = $(this).find("a").attr('href');
        window.location = url;
   });
});

This code will work fine in Firefox and IE, but in Safari it will
return user to the url:
http://someurl.com/http://someurl.com

instead of:
http://someurl.com

How to fix this?
Any ideas?

Thanks a lot for help!