RJS error on IE only: will trade (virtual) beer for (real) answers!

So I'm doing something I've done a million times before with some RJS flavored code, and for some reason it's not working on IE. I've Googled the problem and found only stuff that's not terribly relevant to this problem. Help is much appreciated; I've pulled out what's left of my hair over this one. Here's the deal:

The code is working just swell on Firefox, but on IE it gets an error that says:

RJS error: Object error

... followed by another alert with a bunch of escaped javascript.

The RJS file is very simple:

page[:shebang].replace_html :partial => 'add_description', :object =>@location page[:shebang].visual_effect :blindDown

Even having the partial just render static text, that error pops up. Further, there's no tables in the partial, which I know can be a problem (IE protects TR elements, I gather).

This is not something difficult, and yet I'm getting the error. The only thing I can think of is that we're writing to a div with a Google Map in it using the Cartographer plug-in, but I don't see anything that could conflict ... and when I removed it I still got the error.

I *can* call a basic JS function instead--no errors. And I can even do a homegrown document.getElementById('shebang').innerHTML = "blah"; sort of thing to write to the div, and that works fine. The problem seems to be with the replace_html bit.

<implores kind strangers to offer their advice>

If it helps, the dev site is at:

http://ics.umflint.edu:3103/main/

Thanks!