[SOLVED] Where did those nifty arrows go?

Hi,

In the menu bars of my website, the small arrows that used to appear before the menu items [links] have disappeared. I have been tinkering with the ATA CSS Inserts over the past few days, but I don't know what I did exactly that made them disappear, and I did not keep a back-up Would you guys know where they've gone? And how to get them back?

As always, your response is greatly appreciated!

Kindly,

Rutger