Event.observe(window, 'load', function() {

	var elements = document.getElementsByClassName('clearonfocus');

	for (var i=0; i<elements.length; ++i) {
		Event.observe(elements[i], 'focus', function() {
			if (this.value != this.defaultValue || this.cleared) return;
			this.value = '';
			this.cleared = true;
		});
	}
});