I agree, it seems to be very basic. But it´s wrong explained in the manual.
Try this as start:

Code:

WINDOW WINSTART
{
   TITLE		"Your Title";
   SIZE			512,128;
   MODE			IMAGE;
   BG_PATTERN <your bitmap.bmp>, OPAQUE;
   PROGRESS RGB(0, 0, 255), 25, 0, 110, 512, 18;
}


I´ve to ask Anarchie for "TEXT" and "TEXT_STDOUT", we´ve figured out the issue, but I don´t remind it.
Be sure that your picture has only 8 bit.

no science involved