function popup(url, fullscreen, toolbar, location, status, menubar, scrollbars, resizable, width, height, left, top){
	var config = "fullscreen=" + fullscreen +
                 ", toolbar=" + toolbar +
                 ", location=" + location +
                 ", status=" + status +
                 ", menubar=" + menubar +
                 ", scrollbars=" + scrollbars +
                 ", resizable=" + resizable +
                 ", width=" + width +
                 ", height=" + height +
                 ", left=" + left +
                 ", top=" + top;
     var ventana = window.open(url, "venta", config); 
}