How to make mc move?

I have a movieclip that when you click a button I want to change x-position. For the life of me I can't figure out what is wrong.

On frame 1 I am using:

x=getProperty("circle", _x)

to get the location of the circle. Then on a button I am using the script:

on (press) {setProperty, x=_x + number(200)}

It isn't working. Anyone know what the problem is or how I can make the circle move. I did some searching here and all I can find is how to make things move around randomly and with the mouse. I want this to be a button action and I only want it to move in the x plane.

Soory its off topic, MIG, but I sent you a couple PMs. Not trying to bug ya or anything, just didnt want ya to forget about me.