function equalHeight() {

  var $primary = $('div.primary'); // Save primary area
  var $secondary = $('div.secondary'); // Save secondary area
  
  
  
  if ($primary.height() !== $secondary.height()) {
      
      if ($primary.height() > $secondary.height()) {
        
        var $height = $primary.height();
                     
                     $secondary.height($height);
        
      } else {
        
        var $height = $secondary.height();
                      
                      $primary.height($height);
        
      } 
    }  
}

$(document).load(setTimeout('equalHeight()',500));