function popup(url, width, height, more)

	{

		if (!width) width = 800;

		if (!height) height = 800;

		var x = (screen.width/2-width/2);

		var y = (screen.height/2-height/2);

		window.open(url, "", "scrollbars=0,resizable=0,status=0,toolbar=0,menubar=0,width="+width+",height="+height+",screenX="+(x)+",screenY="+y+",left="+x+",top="+y+(more ? ","+more : ""));

	}