Seeking assistance with my basic JavaScript/jQuery programming

I have a navigation menu link with an ID #navigation li a and a description with a class .menu-description. I would like to update the class from .menu-description to .menu-descriptionnew whenever a user hovers over #navigation li a.

Here is my current jQuery code:

<script>
$(document).ready(function() {
  $('#navigation li a').mouseover(function() {

  //Check if element with class exists, if so change it to new
           if ($('div.menu-description').length != 0)
                $('div.menu-description').removeClass('menu-description').addClass('menu-descriptionnew');
           //Check if element with class 'menu-descriptionnew' exists, if so change it to 'menu-description'
           else if ($('div.menu-descriptionnew').length != 0)
                $('div.menu-descriptionnew').removeClass('menu-descriptionnew').addClass('menu-description');
                });
});
</script>

Unfortunately, this code is not functioning as expected. Any suggestions on how to fix it? Thank you!

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