window.addEvent('domready', function() {
    var tabActive = false;
	
    elms = $$('#menu > li a');
           
    elms.each(function(elm, index){
        $(elm).addEvents({
            'mouseenter': function(){
                tabActive = true;
                this.setStyle('margin-top', (parseInt(this.getStyle('margin-top'))-5) + 'px');
            },
            'mouseleave': function(){
                if (tabActive) this.setStyle('margin-top', (parseInt(this.getStyle('margin-top'))+5) + 'px');
                tabActive = false;
            }
        }); 
    });
});