That might be a scripting error and bottom of page sounds like you are using IE.
Are you using IE7 or IE8?
I'm not seeing an error on the Active Listing page when it loads with IE7. Is the error occuring when you select a listing and click the Add Images button?
If it's a script bug and you are using IE8, you could try viewing the page in IE7 mode with the Compatibility View button on the IE8 toolbar (see it here http://www.microsoft.com/windo...xplorer/default.aspx ).
You could also try with Firefox browser.