function activateimg(whichimg) {
	var imgsrc = new String(document.getElementById(whichimg).src);
	imgsrc = imgsrc.replace(new RegExp('-off\.','g'),'-on\.');
	document.getElementById(whichimg).src = imgsrc;
}
function deactivateimg(whichimg) {
	var imgsrc = new String(document.getElementById(whichimg).src);
	imgsrc = imgsrc.replace(new RegExp('-on\.','g'),'-off\.');
	document.getElementById(whichimg).src = imgsrc;
}