// create a js link to a stylesheet to hide and style hidden content
// avoids 'page bounce' as content is not loaded before being hidden
if (document.getElementById) { 
	var $link_element = document.createElement('link'); 
	$link_element.setAttribute("rel","stylesheet"); 
	$link_element.setAttribute("href","../css/hidden.css"); 
	$link_element.setAttribute("media","screen");
var $head_element = document.getElementsByTagName('head')[0];
$head_element.appendChild($link_element);
}

// the toggle function
function toggleList(listID,headID) {
	var state = document.getElementById(listID).style.display;
	 if (state == 'none') {
     	document.getElementById(listID).style.display = 'block';
		document.getElementById(headID).style.backgroundImage = 'url(../images/dlh2-bk-up.gif)';
	 } else {
     	document.getElementById(listID).style.display = 'none';
		document.getElementById(headID).style.backgroundImage = 'url(../images/dlh2-bk.gif)';
	 }
}