void togglebar(const char* arg)
{
	if (bx==0) {
		bx = ww; // out of screen
		moy = my = wy = 0;
		mh += bh;
		mh += bh;
		if (bw != mw) th += bh;
	} else {
		moy = my = wy = bh;
		mh -= bh;
		mh -= bh;
		if (bw != mw) th -= bh;
		bx = 0;
	}
	// XXX must be done in drawbar ?
	XMoveResizeWindow(dpy, barwin, bx, by, bw, bh);
	drawbar();
	arrange();
}