This plugin adds TinyNav.js to your wp_head() so your menu(s) will be converted into a menu which is better readable on mobile screens.

Beee

This plugin adds TinyNav.js to your wp_head() so your menu(s) will be converted into a menu which is better readable on mobile screens. 
This plugin is based on Viljami Salminen’s <a href="http://tinynav.viljamis.com/" title="TinyNav.js" rel="nofollow ugc">tinynav.js</a>.
A big thanks goes out to Emil Uzelac from <a href="http://themeid.com/" rel="nofollow ugc">ThemeID</a>. Thanks to his Responsive theme I got the idea and with his help I got it working.

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