[jQuery] Browser Crash on SlideToggle (IE)

[jQuery] Browser Crash on SlideToggle (IE)


I have a strange situation where the browser crashes when a
SlideToggle animation is applied. It happens with Internet Explorer 6
and 7. What makes it particularly odd is that it only happens for part
of the site.
Steps to reproduce:
Go to http://www.nelctp.nhs.uk
Click on Help in the bar at the top
Then click on SiteMap
The browser then becomes unresponsive. If you click on SiteMap on any
other pages (as long as they are not under /help/) this problem does
not occur and it slides down as intended.
Anyone able to replicate this or know why it is happening?