ON press problem

I have one mc and one image on the stage. ( Fla attached) . If the movie clip( “btn_mc”)
is pressed the image movie clip start moving to the right side until it reaches to the boundary. My problem is I could not stop this image movie clip in the middle of the journey, what I mean to say the image movie clip start to move when the “btn_mc” pressed but if I release “btn_mc” in the middle of the movement this image_mc is not stopped. Very easy for everyone but I could not figure it out properly.

Any help highly appreciated.

Worthless.