errors on pages

["allisonmains" <webforumsuser@xxxxxxxxxxxxxx>]

I am using a popmenu magic nav bar. I have two issues. In IE I get 'error on 
page' on all my pages and it points me to spot where I define a text. In 
Firefox this doesn't happen but only the top line of my sebmenus show up. When 
I use the 'check browser compatibility' feature the errors point to a 
particular css sheet. Not sure if this has anything to do with my live errors. 
I have checked and my javascript and css sheets are loaded onto the server. Any 
ideas?

 Link is www.butternutvalleynaturecenter.com