jquery.select.js

Replaces select inputs with a dropdown list

How to use

HTML

<select name="xy" id="xy" size="1">...</select>

Script

$(function() {
  $('select').select();
});

If the list went out of the container and isnt visible because its overflow:hidden, you can add the parent container as option:

$(function() {
  $('select').select({
    container: '#parentContainer'
  });
});