meanMenu jumps

[maki3000]

My meanMenu jumps from showing to show the default navigation and back at some stage of browser width. Have a look here: http://meh-ws.ch/div/seiten/neuropaediatrie/de/inhalt/stellen
it's a drupal installation.

i'd be very glad for help!

[maki3000]

i exchanged the way to get the browser width from old version:
currentWidth = document.documentElement.clientWidth || document.body.clientWidth;
to the new version:
currentWidth = window.innerWidth || document.documentElement.clientWidth;

now it seems to work!