IE6, lightboxes, and IFRAMEs

I have a site, which upon clicking an image a lightbox pops up (eg http://www.huddletogether.com/projects/lightbox/).

Our customer still has some machines which run IE6 (upgrading is unfortunately beyond our control), so in order to block out some SELECT elements, I have used the old IFRAME shim trick (as described here: http://weblogs.asp.net/bleroy/archive/2005/08/09/how-to-put-a-div-over-a-select-in-ie.aspx).

However, I have the following problems:

• The lightbox doesn't appear until the mouse is not longer hovering over the page - moving the mosue to a different window, or even just to the scroll bar causes it to appear;
• While the mouse is over the page, the following doesn't happen:
  • Any jQuery animations related to the lightbox stop (or to be more precise, the animation continues in the background, only to have finished upon mouse out);
  • Animated gifs inside the lightbox stop running until mouse out;
  • Javascript in general stops until mouse out.

Everything seems to run fine in our other supported browsers (IE7 and FF).

Unfortunately I don't have a link to show you these effects, but hopefully I have explained myself enough for somebody to help (whi开发者_运维知识库ch will be very gratefully received)!

Edit:

Forgot to say, I know this is related to the IFRAME, as removing it causes the javascript to run fine, but obviously the ugly SELECT boxes bleed through the top DIV.

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It sounds like you have something heavy running in a mousemove or mouseover event handler that's blocking animations, animated GIFs, etc.