var left = 20;
var top  = 85;
function Abrir_ventana (popup, width, height)
{
	var opciones = "toolbar=no, location=no, directories=no, status=no, menubar=no, scrollbars=no, resizable=no, top=" + top + ", left=" + left + ", width=" + width + ", height=" + height;
	window.open('?page=Popup&popup=' + popup, "pagina_" + left, opciones);

	left += width + 20;
    if (left >= 1024)
    {
		top += 100;
        left = 21;
    }
}