tinymce editor “more” graphic broken in ie7

Hi, I am having a problem with the “more” break on posts.

When I use the button in the post editor to enter the “more” code (which in html looks like <!--more-->), when that code is translated or rendered in a post on the website it is in html code that looks like:

<img title="More..." src="../wp-includes/js/tinymce/plugins/wordpress/img/trans.gif" alt="" /><span id="more-589"></span>

The problem is that this is a bad address for the image, and as a result in the IE7 browser, this code shows up as a broken image on the page (rather than just being invisible, which it is in Firefox).

You can see this on the site-in-progress at
http://managebest.net/evreg/2010/02/19/three-papers-from-professor-narushige-michishita/

If you are looking at the page in IE7, you’ll see a broken image right after the spot where it says “(book flyer)”

How do I fix this?

Thanks so much!