In what browser does it start to hang? Testing your page in FF3 and IE7, it seems to run fine for me. BTW, I noticed you added a custom slide up/down modification to the script- does the hanging occur when you remove that custom code?
Right now all I can recommend is that you add a valid doctype to the top of your page, for example:
Code:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
If that doesn't help, another script you can test out is jQuery Tree Menu.
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