Need help making my menu compatible with IE6

Hi!

I am making a site, https://test.sveioskulekorps.no/, and have used the 3 column K2 and tried to implement the menu from the jillij theme (https://www.jillij.com/wordpress/).

I get the menu working the way I want, but only for Firefox, not IE6. I suppose it’s just a minor thing I havn’t managed to make, but I cannot find out what. Have tried to ask for help at the jillij forum, but get no answer. Thought that some here might help me.

Don’t know what spesific information you may need to help me, but just ask, and I will tell as best as I can.

Thanks in advance!