Backgrounds are drawn form 0 when you are at the top.
This will fixed the draw_scroll_bg function.
Find these in function draw_scrolled_bg,
It used to be "intz = (advancey+0.5)/2", now add a "-2", so the bg will be drawed from 0. ( since panel is always drawed from -4, bgspeed = 1/2 panelspeed....)
