var tempname = '';

function Img(name) {
	if (name) {
		if (name != tempname) {
			document[name].src='images/nav_point_on.gif';
			if (tempname != '') { document[tempname].src='images/nav_point_off.gif'; }
		}
		tempname = name;
	}
	else {
		document[tempname].src='images/nav_point_off.gif'; 
		tempname = '';
	}
}