Controlling a movieclip's internal timeline w/ x+y

Hello

Im really struggling with controlling a movieclip (frame-by-frame images w/ stop(); actions) by using the mouses horizontal position on the main stage. So basically I want to turn my stage into a showreel of images. Lets say the stage is 50 pixels; i would want some kind of code that would divide up the total length of my m/cs timeline, in order to show the first frame of the m/c when the y-axis is at 0, the last keyframe of the m/c when the y-axis = 500.

I have tried to use rollover commands on (miniscule) hit states covering the entire stage, but there must be a better way ( i plan on updating the images m/c a lot) ie. a lovely big chunk of confusing code?

Does anyone have any idea?

Struggling man down! Dan
:ex::ex::ex: