This is probably an incredibly noobish question, but I can't figure out how to stretch a bitmap/panel. I've searched through the manual a couple of times, but I haven't found anything

scale_x and scale_y elemnts of panels. check the manual.

It doesn't really say how to stretch to the whole screen

it is not hard to figure out...
it says you can scale panels with this variables.

get your head to use and think, you have width and height of your panel/bmap(bmap_height and bmap_weight functions), and width and height of the screen(screen_size.x and screen_size.y), now how could you scale it to whole screen?

Oh, Thanks!