my code:

distancing_mc.onEnterFrame = function() {

xdist = Math.round(_root._xmouse - _x);

ydist = Math.round(_root._ymouse - _y);

distancefromthis = Math.round(Math.sqrt((xdist*xdist) + (ydist*ydist)));

circle_mc._width = (100-distancefromthis)+20;

circle_mc._height = (100-distancefromthis)+20;

}

I have a circle that gets larger/smaller depending upon where the mouse is in comparison to the circle. How would I set parameters so that the circle would shrink only to a certain size and also grow only to a certain size?