these mouseovers are they linked to your pages or other websites?
the reason I mention this is because they are linked to (for example)
http://canadaoutfitterdirectory.com/alberta -if alberta is going to be a page in your website, then you just need to link to alberta.html
this will cause a slow load as well. just a thought.
And I also notice on the page mentioned, the mouseover on this page is missing the AB-NB-NL-NT-NS as well.AHHH!