function view_layer(obj, value, imgsrc, bgcode)
{
	for(i=1; i<6; i++)
	{
		document.all['menu' + i].style.visibility = "hidden";
		document.all['mu' + i].src = './images/menu1_' + i + '.gif';
	}
	document.all['mu' + obj].src = imgsrc;
	document.all['menu' + obj].style.backgroundColor = bgcode;
	document.all['menu' + obj].style.visibility = value;
}