function toggleMenu(menu) {

	var t = document.getElementById(menu);

	t.style.display = ((t.style.display == 'block') ? 'none' : 'block');
	var ele = $$('#sidenav > ul').getSize();

	$('sidenav').setStyle('height', ele[0].y + 375 + 'px');
	
	recalculateSize();
	
}

function recalculateSize(){
	
	if ($('sidenav').clientHeight > $('main').clientHeight){

		$('main').style.height = $('sidenav').clientHeight + 'px';

	} else if ($('main').clientHeight > $('sidenav').clientHeight){

		$('sidenav').style.height = $('main').clientHeight + 'px';

	}

}