function initNav() {
	//if (!document.getElementById && !document.getElementsByTagName) return false;
	
	var nav = document.getElementById('nav');
	var nav_sections = nav.getElementsByTagName('dl');
	
	for (var i=0; i < nav_sections.length; i++) {
		var nav_description = nav_sections[i].getElementsByTagName('dd')[0];
		nav_description.className = "off";
		
		nav_sections[i].onmouseover = function() {
			this.getElementsByTagName('dd')[0].className = "on";
		};
		
		nav_sections[i].onmouseout = function() {
			this.getElementsByTagName('dd')[0].className = "off";
		};
	}
}

addLoadEvent(initNav);