function swap_me(o,to_what,nochange,ext) {
	if (nochange=='') {
		var towhat, ext;
		towhat='../_img/'+to_what+'.'+ext;
		o.src	= towhat;
	}
}

function swap_m(img_name,to_what,nochange,ext) {
	if (nochange=='') {
		var swap, towhat, ext;
		swap	= eval('document.images.'+img_name);
		towhat='/_img/'+to_what+'.'+ext;
		swap.src	= towhat;
	}
}