// landing slider
document.observe("dom:loaded", function(){
  
  $$(".feature ul.description li").each(function(list_element){
    list_element.observe("click", function(event){
      //clear acvive element
      $$(".feature ul.description li a.active").invoke("removeClassName", 'active')
      list_element.down('a').addClassName('active')
      // hide expanded divs
      $$('#feature-expansion div').invoke("hide")
      $$("#feature-expansion div."+list_element.classNames()).invoke("show")
      
    });
  });
  
});