Apply specified Function to multiple of movie clips

programming flash
1

[FONT=Verdana]How would I apply my existing function that involves calculating the x and y position of a specified movie clip, to multiples of movieclips. [/FONT]
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[FONT=Verdana]MY MOVIECLIPS on stage are[/FONT]
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[FONT=Verdana] Ball_mc [/FONT]
[FONT=Verdana] Ball_mc2[/FONT]
[FONT=Verdana] Ball_mc3 [/FONT]

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[FONT=Verdana]MY FUNCTION is [/FONT]
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[FONT=Verdana]function hitDetect(event):void {[/FONT]
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[FONT=Verdana]var ballX:Number = (ball_mc.x-videoX)/sizeDif[/FONT]
[FONT=Verdana]var ballY:Number =  (ball_mc.y-videoY)/sizeDif[/FONT]
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[FONT=Verdana]var valNow:Number = (now.getPixel(ballX, ballY) >> 16 & 0xFF);[/FONT]
[FONT=Verdana]var valBefore:Number = (before.getPixel(ballX, ballY) >> 16 & 0xFF);[/FONT]
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[FONT=Verdana]Should I use Arrays? Loop? Or Any other suggestions? Examples in code would be appreciated. Thanks[/FONT]