window.addEvent('domready', function() {
    var tooltips = new Tips($$('.tooltip'), {
    	className: 'custom',
        initialize:function(){
        	this.fx = new Fx.Style(this.toolTip, 'opacity', {duration: 300, wait: false}).set(0);
        },
        onShow: function(toolTip) {
        	this.fx.start(1);
        },
        onHide: function(toolTip) {
        	this.fx.start(0);
        }
    });
});