Hello

How can I set a 1024*768 wallpaper(bmp format) as a background for a sidescroller game ?

By using a panel:

http://www.conitec.net/beta/apanel.htm

or a view entity

http://www.conitec.net/beta/aentities-intro.htm

with a negative layer.

But when I use a negative layer it doesn't show my background and my background become invisible!!
can u give me an example?
thanks/

I did it but the panel became invisible!!

Lol, just add on all layers 1 and out this layer on 0 or 1

If you loaded a wmb level:
Do you set the sky_color to zero? Only then the Background from your level is disabled and you can see the Panels with negative layers.

vec_set (sky_color,vector(0,0,0));

Oh thanks a lot "Widi" .
it works ...

You are welcome

Btw.: I tested the above code. It works out of the box. If the above example did not run you most likely added it to your existing code, where a sky_color was set.