// maybe blit a bitmap of a help overlay to the screen
void help_overlay_maybe_blit(int overlay_id)
{
	Assert(overlay_id >= 0 && overlay_id < MAX_HELP_OVERLAYS);

	if ( Help_overlay_flags & (1<<overlay_id) ) {
		context_help_grey_screen();
		help_overlay_blit(overlay_id);				
	}
}
// maybe blit a bitmap of a help overlay to the screen
void help_overlay_maybe_blit(int overlay_id, int resolution_index)
{
	Assert(overlay_id < MAX_HELP_OVERLAYS);

	if ( (overlay_id >= 0) && (Help_overlay_flags & (1<<overlay_id)) &&
			(resolution_index >= 0) && (resolution_index < help_overlaylist[overlay_id].num_resolutions) ) {
		context_help_grey_screen();
		help_overlay_blit(overlay_id, resolution_index);
	}
}