var AddHoverSupport = Class.create({
   initialize : function(selector) {  
      $$(selector).each (function(item) {
         item.observe('mouseenter', function() {
            item.addClassName('hover');
         });
         item.observe('mouseleave', function() {
            item.removeClassName('hover');
         });
      });
   }  
});

function externalLinks() {
   $$('a[href][rel=external]').each(function(item) {
      item.target = '_blank';
   });
}

// Spusteni akci na DOM:onload - neceka se na nahrani obrazku/flashe/appletu...
document.observe('dom:loaded', function() {
   externalLinks();
   if (Prototype.Browser.IE) {
      new AddHoverSupport('#menu1 li');
   }
});