Hi there

My client has an image that when hovered over displays different plots of land/buildings. The code works fine in Firefox but does not work in IE9. Instead of the hover image being displayed there is just a grey box.

Please could somebody point me in the right direction?

How it should look (firefox):


How it looks in IE9:


The URL is:
http://www.grovemere.com/Development-Land/

Many Thanks

Rob