Please could someone assist me?

Ive been useing a javascript navigational menu i got from the below website for a couple of years now, and i hadnt had a problem with it.

Now that ive started to embed you tube video's for a new page idea on my site, i noticed that the hv menu sub menu's drop down behind the video's.

With advice that ive already received in the thread link below ive tried altering the var Ztop=100 to var Ztop=1001 which can be found in a file called "menu_com.js"

If someone could please take a look for me ive uploaded a rougth copy of the page the menu is on to a spare server, link below.

Heres a link to the javascript files that run the HV menu