Scrollbar offset issue

Hey I was just working on the easy scrollbar tutorial off this site, Everything works great except for when i click the scrollFace, it offsets about 20 pixels to the right? I was looking through the code and I couldnt figure it out, I have redesigned the complete scrollbar in my own project and tried to make new scrollfaces,
Any suggestions for fixing this problem would be greatly appreacitated,

I think it has something to do with this code

startDrag(this, false, left, top, right, bottom);

Thanks,
GP

Thanks