Apply the script two times on one page

I'd like to use the script for 2 navigations on one page:

```
$("#menu-main").mobileMenu({
  prependTo: '#header nav .container',
  switchWidth: 600
});
$("#menu-footer").mobileMenu({
  prependTo: '#footer .footer-menu',
  switchWidth: 600
});
```

But only the first one works. Footer navigation disappears.
