Buttons problem

If anyone can help me with this then youre a life saver:)
On my main page i have buttons that load in a movie clip into a taget guide.
In this movie clip I have a line of images that scroll into view at the start and i also have a number of buttons to scroll this movie clip, this is the action on my buttons;
on (release) {
_root.xpos = -2959;
}
the xpos is different on each button depending on how far i want it to move the line of images.
but the problem is that when i choose to load in a new movie clip(into the same guide) it will load into the xpos of the button that was last selected which sometimes makes it scroll right past all the content:(
so how can i stop this

thanks