/*** scripts for tree menus, EfnWeb, LLC ***/

	function toggle_gallery(id) { // show/hide div
		var div = document.getElementById(id);
		if(div.style.display == 'block') {
			div.style.display = 'none';
		} else {
			div.style.display = 'block';
		}
	}
	
	function toggle_arrow(id) { // toggle arrow indicator image 
		var arrowImg = document.getElementById(id);
		var arrowPath = 'http://' + location.hostname + '/images/';
		if(arrowImg.src == arrowPath + 'arrow_open.gif') {
			arrowImg.src = arrowPath + 'arrow_closed.gif';
		} else {
			arrowImg.src = arrowPath + 'arrow_open.gif';
		}
	}
	
	// preload arrow open image
	if(document.images) {
  		arrowImg 		= new Image(10,10); 
  		arrowImg.src	= '/images/arrow_open.gif'; 
	}