When I enter the API urls into my browser they work, but when I try from jQuery they just return null. When I open the html below all I get is an alert that says null, despite the fact that Firebug shows me that the correct request was made. Thanks for your help!

    <html>
    <head>
    <title>Test</title>   
     </head>
        <body>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js" type="text/javascript"></script>
        <script type="text/javascript">//<![CDATA[
        
          $(document).ready(function(){
        	
        	$.ajax({
          url: "http://api.stackoverflow.com/0.8/stats",
          dataType: 'json',
          success: function(data, text, xhr){
        	alert(data);
        	alert(text);
        	alert(xhr);
        	}
        });
          
          });
        
         //]]>
        </script>
        </body>
        </html>