Which kind of DHTML do you mean?
Anyway, pico supports hierarchical submenu, you can make DHTML like this.
(auto translate by google)
http://64.233.179.104/translate_c?hl=ja&langpair=ja%7Cen&u=http://www.xugj.org/modules/d3...And you can edit pico's templates via altsys as you like.
If you are familiar with DHTML, you can implement any DHTMLs into pico's template.