var active_item;
function show_menu ( link_id, submenu_id ) {
	var link = document.getElementById( link_id );
	var submenu = document.getElementById( submenu_id );
	submenu.style.display='block';
	link.className='link_1 ov';
}
function iframe_menu (links, subframe ) {
	var links = document.getElementById( links );
	var subframe = document.getElementById( subframe );
	subframe.style.height = links.offsetHeight+'px';
	subframe.style.width = links.offsetWidth+'px';
}
function hide_menu ( link_id, submenu_id ) {
	var link = document.getElementById( link_id );
	var submenu = document.getElementById( submenu_id );
	submenu.style.display='none';
	if ( link_id != active_item ) {
		link.className='link_1';
	}
}