problem in action script3 function prevFrame

i made a button if you rollover on it it's size is larger i want if you roll out开发者_JAVA百科 on it it's size return back to it's original size i use this function prevFrame but my problem is when i use it it stops on the previous frame only and i want to stop from the starting

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You can label your frames an use the gotoAndStop() method

function onRollover(event:MouseEvent):void
{
   gotoAndStop('largeSize');
}

function onRollOut(event:MouseEvent):void
{
   gotoAndStop('normalSize');
}