// Collapse/Hide main navigation
// Source: http://www.dustindiaz.com/dhtml-expand-and-collapse-div-menu/
function switchMenu(obj) {
	var el = document.getElementById(obj);
	if ( el.style.display != "none" ) {
		el.style.display = 'none';
	}
	else {
		el.style.display = '';
	}
}