function toggleNav(nav_img,nav_sec){
	var e = document.getElementById(nav_sec).style
	if (e.overflow == 'hidden'){
		e.overflow = '';
		e.height = '';
		nav_img.className = '';
	}else{
		e.overflow = 'hidden';
		e.height = '26px';
		nav_img.className = 'closed';}
}