[jQuery] [treeview] ie6 no expand/colapse

[jQuery] [treeview] ie6 no expand/colapse

<a href="http://63.144.103.199/industrial/enclosures/wallmount/index.cfm" target="_blank"> http://63.144.103.199/</a>
works fine in ie7 and ff
but in ie6 it dosnt collapse/expand onclick of the plus symbol
any ideas?
thanks
<font color="#888888">-paul</font>