function topOver(n) {
		document.images['ar' + n].src=pl[3].src;
		}
		
	function topOut(n) {
		document.images['ar' + n].src='./images/spacer.gif';
		}
				
	function topmOver(n) {
		document.images['am' + n].src=pl[2].src;
		}
		
	function topmOver(n,m) {
		document.images['am' + n + m].src=pl[2].src;
		}
		
	function topmOut(n,m) {
		document.images['am' + n + m].src='./images/nucrf_arrow.gif';
		}