Event.observe(window, 'load', function()
{
    var self = this;
        self.selected = $$('div.Tabs ul.items li.selected')[0];
        self.content  = $$('div.Tabs div.tab-content.selected')[0];
    $$('div.Tabs ul.items li').each(function( item ){
        item.observe('click', function( event ){
            Event.stop( event );
            self.selected.removeClassName('selected');
            self.selected = this.addClassName('selected');
            if ( self.content.nodeType ) {
                self.content.removeClassName('selected');
                self.content = this.up('div.Tabs').getElementsBySelector('div.tab-content.' + (this.className.split(' ')[0]))[0].addClassName('selected');
            }
        });
    });
});