AnimateWindow

how come i cant use AnimateWindow?

PHP Code:

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        AnimateWindow (hWnd, 400, AW_ACTIVATE | AW_BLEND); 


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i am using windows XP..what's wrong?
thanks in advance

Amon Ra

anybody have any ideas?

i have checked on the platform sdk, but it doesn't say anything. i am really using what it says i should be using..i dont get it