Youtube search api parse issue
===

I am developing youtube IOS application. I want to get video image on response. 

Here is response part,

    "media:thumbnail" =         (
                            {
                    "@height" = 360;
                    "@time" = "00:00:51.500";
                    "@url" = "http://i.ytimg.com/vi/S8OG7dN-66Q/0.jpg";
                    "@width" = 480;
                },
                            {
                    "@height" = 90;
                    "@time" = "00:00:25.750";
                    "@url" = "http://i.ytimg.com/vi/S8OG7dN-66Q/1.jpg";
                    "@width" = 120;
                },
                            {
                    "@height" = 90;
                    "@time" = "00:00:51.500";
                    "@url" = "http://i.ytimg.com/vi/S8OG7dN-66Q/2.jpg";
                    "@width" = 120;
                },
                            {
                    "@height" = 90;
                    "@time" = "00:01:17.250";
                    "@url" = "http://i.ytimg.com/vi/S8OG7dN-66Q/3.jpg";
                    "@width" = 120;
                }
            );

I want get @url tag value but I did not 

Thnx