Top level menu items - want to be expandable - not clickable

[ersin fahredin]

How to make tm mega menu module top level items (categories) not clickable, just i want they to expand, when it is clicked on them, so the subcategories to be showed, not to lead to page of main category.

I`m using Prestashop 1.6.1.24 version.
For horizontal top menu: TM Mega Menu.

Maybe i have to edit tmmegamenu.js, but i don`t know how, my jquery is not so good.

I`m attaching screenshot, so when i touch for example Car Audio & Video, it must expand (dropdown the subcategories, instead of leading to page of main category).