function toggleMenu(el, over) {}

function toggleMainMenu(el, over) {
    if (over) {
        Element.addClassName(el, 'over');
    } else {
        Element.removeClassName(el, 'over');
    }
}

document.observe('dom:loaded', function() {
    if ($('nav')) {
        var num_cells = 2; 
        var count = $('nav').childElements().size();        
        var n = (count - (count % num_cells)) / num_cells;
        var cells = [];
        for (var i=0; i<num_cells; i++) { cells[i] = n; }
        for (var i=0; i<(count % num_cells); i++) { cells[i] += 1; }
        var boxes = [];
        var c = 0;
        for (var i=0; i<num_cells; i++) {
            var li = new Element('li', {});            
            var ul = new Element('ul', {});
            if (i == num_cells - 1) { li.addClassName('last'); }
            for (var n=0; n<cells[i]; n++) {
                var node = $('nav').childElements()[c].cloneNode(true);
                if (n == cells[i] - 1) { node.addClassName('last'); }
                ul.appendChild(node);
                c += 1;
            }
            li.appendChild(ul);
            boxes.push(li)                       
        }
        $('nav').childElements().invoke('remove');
        boxes.each(function(box) {
            $('nav').appendChild(box);
        });  
    }    
});