function autoscroll_popup(u, w, h)
{
	var screenw, screenh, lmargin, tmargin;
	screenw = parseInt(screen.availWidth);
	screenh = parseInt(screen.availHeight);

	if(w > screenw) {
		w = screenw;
	}
	if(h > screenh) {
		h = screenh;
	}

	if(screenw > w) {
		lmargin = Math.ceil((screenw - w) / 2);
	} else {
		lmargin = 0;
	}
	if(screenh > h) {
		tmargin = Math.ceil((screenh - h) / 2);
	} else {
		tmargin = 0;
	}

	window.open("/popup.html?u=" + u + "&w=" + w + "&h=" + h, "_blank", "width=300,height=400,left=" + lmargin + ",top=" + tmargin);
}