I added dhtml menus to wordpress 2.1, safe to do ?

I added the dhtml FreeStyle menus from https://www.twinhelix.com/dhtml/fsmenu/ to my blog. Of course, some of the links point back to the static site and some to the blog. I’ll move pages as I have time, some of the large map pages wont be moved.

I was wondering if this addition to my blog was safe ? Or not safe ?

my site is:
https://crestar.drivein-jim.net/testy/

Thanks.
(I was here around a year ago, but I couldn’t remember my old login.)