onload = function() {
	var e, i = 0;
	while (e = document.getElementsByTagName ('B') [i++]) {
		if (e.className == 'yswitch') {
		e.onclick = function () {
			this.className = this.className == 'yswitch' ? 'yswitch yoff' : 'yswitch';
			this.nextSibling.className = this.className == 'yswitch' ? 'yhide' : 'yshow';
			}
		}
	}
}