http://hazienda-arche-noah.de/tl_files/chameleon/scripts/mobile_menu.js

1jQuery(document).ready(function() {
2 
3    //build mobilenavi
4    jQuery("<select id='mobile-select' />").appendTo("#mainmenu");
5 
6    jQuery("<option />", {
7       "selected": "selected",
8       "value"   : "",
9       "text"    : "Select menu"
10    }).appendTo("#mainmenu select"); 
11 
12    //Menu items
13    jQuery("#mobilenavi li a").each(function() {
14        var el = jQuery(this);
15        jQuery("<option />", {
16            "value"   : el.attr("href"),
17            "text"    : el.text()
18        }).appendTo("#mainmenu select");
19    });
20 
21    //Link
22    jQuery("#mainmenu select").change(function() {
23        window.location = jQuery(this).find("option:selected").val();
24    });
25 
26});