void SGR_Background(color) int color;
void SGR_Background(int color)
void SGR_Background(color)	int color;{	register TScreen *screen = &term->screen;	Pixel	bg;	if (color >= 0) {		term->flags |= BG_COLOR;	} else {		term->flags &= ~BG_COLOR;	}	bg = getXtermBackground(term->flags, color);	term->cur_background = color;	XSetBackground(screen->display, NormalGC(screen), bg);	XSetForeground(screen->display, ReverseGC(screen), bg);	if (NormalGC(screen) != NormalBoldGC(screen)) {		XSetBackground(screen->display, NormalBoldGC(screen), bg);		XSetForeground(screen->display, ReverseBoldGC(screen), bg);	}}