Scripting

I'm new. My colleage has left the company, so i don't know how to do this.
in wisescript editor version 7 sp3 i have created a "install.wse"
with the following code of earlier script.

If System Doesn't Have 1024x768 Graphics or Better then
Display Billboard Include\Images\800.bmp (Center Horz) (Center Vert)
Else
Display Billboard Include\Images\1024.bmp (Center Horz) (Center Vert)
End

If I compile it an run it, he doesn't saw the image

A earlier script let me see a windows with brown color with this image,
how can i set it up ? I want a gray windows with the image

Kind Regards
Steven