A Cross-Domain AJAX URL works in Gecko & Webkit but not in Opera & IE

A Cross-Domain AJAX URL works in Gecko & Webkit but not in Opera & IE

How does this cross-domain request work in FireFox, Safari & Chrome and not in IE/Opera ?
  1. $(document).ready(function()
  2. {
  3.     $.ajax(
  4.     {
  5.         url: "http://picasaweb.google.com/data/feed/api/user/snmoorthy48?kind=album&alt=json",
  6.         success: function(data)
  7.         {
  8.             alert(data);
  9.             if (console) console.log(data);
  10.             if (data == "") alert("Invalid User");
  11.         }
  12.     });
  13. });