// JavaScript Document
function toggle(div, head) {
	var heading = document.getElementById(head);
	var links = document.getElementById(div);
	if ( links.style.display != 'none' ) {
		links.style.display = 'none';
		//links.style.overflow = 'hidden';
		heading.className = 'nav_heading_closed';
		
	}
	else {
		links.style.display = 'block';
		heading.className = 'nav_heading_open';
	}
}