keywordsHidden = new Class({
	initialize: function(){
		this.elements = [];
		$$(arguments).each(function(elId, index){
			this.elements.push($(elId));	
		}, this);
		this.elements.each(function(element, index){
			if (element.getProperty('value')=='')
				element.setProperty('value','*');
			element.addEvents({
				'focus': function(e){
					if(element.getProperty('value') == '*') element.setProperty('value', '');
				},
				'blur': function(e){
					if(element.getProperty('value') == '') element.setProperty('value', '*');
				}
			});
		});
	}
});