function legend() {
	theWidth = 520;
	theHeight = 450;
	theTop = Math.ceil((screen.height-theHeight*1.5)/2);
	theLeft = Math.ceil((screen.width-theWidth)/2);
	winopts = "toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=no,resizable=no,copyhistory=0,width="+theWidth+",height="+theHeight+",top="+theTop+",left="+theLeft;
	smallwindow=window.open("/legend.dhtml","legend",winopts);
 	smallwindow.focus();
}