var WatermarkLabel = Class.create({
	initialize: function(id) {
		this.textbox = $(id);
		this.text = '';

		var labels = $$('label[for="' + id + '"]');
		if(labels.length) {
			this.text = labels[0].innerHTML;
			Element.hide(labels[0]);
		}

		this.textbox.observe('focus', this.focus.bindAsEventListener(this));
		this.textbox.observe('blur', this.blur.bindAsEventListener(this));
		this.blur();
	},

	focus: function(event) {
		if(this.empty)
			this.textbox.value = '';
		this.empty = false;
		this.textbox.removeClassName('empty');
	},

	blur: function(event) {
		if(this.textbox.value == '') {
			this.textbox.value = this.text;
			this.textbox.addClassName('empty');
			this.empty = true;
		}
	}
});