IE6 Iframe Shim Issues

1) Script Title: All Levels Navigational Menu

2) Script URL (on DD): http://www.dynamicdrive.com/dynamici...menu/index.htm

3) Describe problem: I like this menu, however I'm seeing two problems with the IFrame Shim option (enableshim: true) when viewed with IE6 (unfortunately I'm stuck using IE6 for the forseeable future). Both problems relate to drop-downs in the content iframe showing up on top of the menu. These problems are demonstrated at http://www.100megsfree.com/croyer/testddrive.html:

Problem 1) When mousing over the side menu, the top element in the first submenu shows up behind the iframe dropdowns. The shim appears to work properly for all other submenu elements except the top one.

Problem 2) The shimming seems to work properly for the top menu except for one instance. Go to testddrive.html listed above and follow these steps:
a) Mouseover the top-level "DHTML" button
b) Mousedown to any element in the first sub-menu
c) Mouse straight back up to the top-level "CSS" button and hold. You should now see the iframe drop-downs on top of the sub-menu instead of underneath. This problem also exists for the side menu. If you go straight from an element on the first side submenu straight back to a different top-level side button, the drop-downs show up on top.

I'd really appreaciate any help with this, or alternative menu suggestions - thanks!