$$('#days-menu a').addEvent('click',function(){ $$('#days-menu a').setStyle('background-position','center 4px'); var selected_day = this.getAttribute("id"); $(selected_day).setStyle('background-position','center -25px'); $$('.menu ul').setStyle('display','none'); $('day_' + this.getAttribute("id")).setStyles({'display':'block','top':'0'}); });