window.addEvent(
  'domready',
  function()
  {
  // EQUAL HEIGHTS
  var height = 0;
  
  divs = $$('.block');
   
  divs.each( function(e){
   if (e.offsetHeight > height){
    height = e.offsetHeight;
   }
  });
   
  divs.each( function(e){
   e.setStyle( 'height', height + 'px' );
   if (e.offsetHeight > height) {
    e.setStyle( 'height', (height - (e.offsetHeight - height)) + 'px' );
   }
  }); // END EQUAL HEIGHTS
  }
);