Problem in graph api

Question

Dear All, I m using graph api of facebook to publish messages on wall.i m using following

function which publish messages on wall .

function streamPublish(){

                FB.ui(
   {
     method: 'stream.publish',
     message: 'hii',
     attachment: {
       name: 'testing',
       caption: 'my name is ange',
       description: (
         'testing.'
       ),
       href: 'http://abcm.com'
     },
     action_links: [
       { text: 'Code', href: 'http://cabc.com' }
     ],
     user_message_prompt: 'Share your thoughts about site'
   },
   function(response) {
     if (response && response.post_id) {
       alert('Post was published.');
     } else {
       alert('Post was not published.');
     }
   }
 );

this function is able to post messages when i m using mozilla or chrome,but in internet explorer i m getting FB is undefined.

Please share what i can do to solve this problem