function $(id) {
	return document.getElementById(id);
}
function nav_open(menu) {
	if ($('lnav_' + menu).style.display == 'block')
		nav_close();
	else {
		nav_close();
		$('lnav_' + menu).style.display = 'block';
	}
}
function nav_close() {
	eleUL = document.getElementsByTagName('ul');
	for (i=0; i<eleUL.length; i++)
		if (eleUL[i].id.indexOf('lnav_') != -1)
			eleUL[i].style.display = 'none';
}


function display(action, id) {
	alldivs = document.getElementsByTagName('div');
	for (i=0;i<alldivs.length;i++)
		if (alldivs[i].id.indexOf('subnav')==0)
			alldivs[i].style.display = 'none';

	document.getElementById("subnav"+id).style.display = (action == 'show') ? 'block' : 'none';
}