Error in Facebook application in IE

In my Facebook application one pa开发者_运维百科ge is giving this error in IE but it is working in Mozilla. Please help me.

Message: FB is undefined
Line: 154
Char: 17
Code: 0
URI: http:------

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It means the FB javascript object is not loaded yet or cannot be loaded.

Make sure to wait for the document to be ready before calling FB.init()!