does anyone have any experience with the scrollbar script from ghtml.com ?

i have just converted 1 test page of my site to XHTML, and i'm using the script for that scrollbar. the xhtml is validated, and the scrollbar works great in Mozilla/NS on my Mac (os x), but it wont work in IE 5.2 for mac!
it DOES however work in IE for windows, as i've been told.

the weird thing is, when i remove the DTD, the scrollbar WILL work in IE for mac. now i thought having a DTD was supposed to eliminate this browser quirk stuff?

here's a link to the page

does anyone know what i'm doing wrong? thanks!