Scrolling movie clip with buttons

Hi, I have a horizontal movieclip that I want to scroll. I want to use two arrows that I’ve made; one facing left and one facing right. When I click down on the arrows I want the movie clip to continue to scroll till either it gets to the end or till the user releases the arrow.
The script i have on the movie clip is:
on(load)
{
left = false;
right = false;
maxL = someNumber;
maxR = someOtherNumber;

}
on(enterFrame)
{
if(left)
{
if(this._x > maxL)
{
this._x +=1;
}
}else if (right)
{
if(this._x < maxR)
{
this._x -=1;
}
}
}

and the script on the buttons is:

on(press)
{
_parent.movieclip.left = true;
}
on(release)
{
_parent.movieclip.left = false;
}

I found the script on another site, but when i use it and export the movie nothing happens, the buttons don’t work… if anyone could please help i would really appreciate it… i’m not very actionscript literate (i know all the basics) and have been struggling with this and going through similar scrolling tutorials for ages :stare: , if it helps the page i’m eventually going to make work is http://www.jeanetteclement.co.uk/chrisdye/gallery the movieclip will be the background with the picture thumbnails…