carter(tech)

// put this is your in your head section, it starts the magic


//this also goes in the head section, but is where each element -- with the said class -- will be manipulated.
You can do anything inside this function, where c is each element. This code specifically expands and collapses each element.
function toggleElements(classname){
   $$('.'+classname).each(
      function(c){
         if(c.style.display == 'none'){
            c.setStyle({display: 'block'});
         }else{
            c.setStyle({display: 'none'});
         }
      }
   );
}

toggleElements('divclassname');

// this can be added to an HTML onclick event to fire when the button is clicked, like zoy: