function menu_top_hover(id)
{
	var top_id = 'menu_top_' + id;
	var sub_id = 'menu_sub_' + id;

	for (i = 0; i < 6; i++)
	{
		var iter_top_id = 'menu_top_' + i;
		if (!document.getElementById(top_id))
			break;
			
		var iter_sub_id = 'menu_sub_' + i;

		document.getElementById(iter_top_id).style.backgroundImage = (iter_top_id == top_id ? 'url(\'design/dvpj/design_pics/menu_top_background_arrow.png\')' : 'none');

		if (document.getElementById(iter_sub_id)) {
			document.getElementById(iter_sub_id).style.display = (sub_id == iter_sub_id ? 'block' : 'none');
		}
	}
}