window.addEvent('domready', function() {
	if ($('key').value != "") $('key').getPrevious('label').style.display = "none";
	
	$('key').addEvents({
		focus: function() {
			this.getPrevious('label').style.display = "none";
		},
		blur: function() {
			if (this.value == "") {
				this.getPrevious('label').style.display = "block";
			}
		}
	});
});