function imgOn(num) {
	if (document.images) {
		document["img" + num].src = imgon[num].src;
	}
}
function imgOff(num) {
	if (document.images && document["img" + num]) {
		document["img" + num].src = imgoff[num].src;
	}
}
function imgOver(num) {
	window.status=legend[num];
	if (document.images && selected != num) {
		document["img" + num].src = imgover[num].src;
		document["img" + num].style.cursor = "hand";
	}
}
function imgOut(num) {
	if (document.images && selected != num) {
		imgOff(num);
	}
	window.status='...';
}
function select(num) {
	window.status='...';
	if (num == 0) {
		if (selected != 0) {
			imgOff(selected);
		}
		selected=0;
	} else {
		if (num != selected) {
			if (selected != 0) {
				imgOff(selected);
			}
			imgOn(num);
			selected = num;
		} 
	}
	return 1;
}