<!--
//<![CDATA[
function toggle_menu(subMenu)
{
	if(document.getElementById)
	{
		if(subMenu == 'off')
			var objmenu="off";
		else
		{
			var objmenu = eval("document.getElementById('"+subMenu+"')");
			switch_on(objmenu);
		}
		var aboutmenu = eval("document.getElementById('about_sub')");
		var servmenu = eval("document.getElementById('serv_sub')");
		var subsmenu = eval("document.getElementById('subs_sub')");
		var courmenu = eval("document.getElementById('cour_sub')");
		var vlibmenu = eval("document.getElementById('virt_sub')");
		if(aboutmenu != objmenu)
			switch_off(aboutmenu);
		if(servmenu != objmenu)
			switch_off(servmenu);
		if(subsmenu != objmenu)
			switch_off(subsmenu);
		if(courmenu != objmenu)
			switch_off(courmenu);
		if(vlibmenu != objmenu)
			switch_off(vlibmenu);
	}
	return(true);
}

function switch_on(objMenu)
{
		objMenu.className='on';
		objMenu.style.display='block';
}

function switch_off(objMenu)
{
	if(objMenu)
	{
		objMenu.className='off';
		objMenu.style.display='none';
	}
}
//]]
-->