Positioning a MC in accordance with another's size

Hi,

I am trying to make a series of Movie Clips that lay next to each other on the X axis that will alter their _x value in accordance with the MC next to it. ie. When the width or _x value of the MC to the left increases the _x value of the MC changes.

mc_1._x = 0;
mc_2._x = mc_1._xscale;

mc_2.onEnterFrame = function(){
	if(mc_1._xscale > 107){
		mc_2._x = mc_1._xscale;
	}
}

I think this could be way off!!! Any suggestions would be great?
Phil