var mimg = new Element('img', {
            'src': '/media/img/gumb_border.png',
            'alt': 'img',
            'class': 'mimg'
            });

    function markActiveTab(id) {
        var active = $('menu').getElement(id);
        active.addClass('active');
        active.grab(mimg.clone(true, true), 'top');
        active.grab(mimg.clone(true, true), 'bottom');
        active.getElement('a').set('styles', {
            'background-image': 'url(/media/img/gumb.png)',
            'background-repeat': 'repeat-x'
    });

    }

window.addEvent('domready', function() {
   $('menu').getElements('a').addEvent('mouseenter', function(e){
        var target = $(e.target);
        if (target.getParent().getProperty('class') != 'active') {
            target.getParent().grab(mimg.clone(true,true), 'top');
            target.getParent().grab(mimg.clone(true,true), 'bottom');
            target.set('styles', {
                'background-image': 'url(/media/img/gumb.png)',
                'background-repeat': 'repeat-x',
                'padding-left': '9px',
                'padding-right': '9px'
            });
        };
    });

    $('menu').getElements('a').addEvent('mouseleave', function(e){
        var target = $(e.target);
        if (target.getParent().getProperty('class') != "active") {
            target.getParent().getElements('img').each(function(el){
                el.dispose();
            });
            target.set('styles', {
                'background-image': 'none',
                'background-repeat': 'no-repeat',
                'padding-left': '10px',
                'padding-right': '10px'
            });
        };
    });
});