Yay! I managed to fix the IE problem too. It's probably something that everyone in the world knows - except me, but I'll put it here in case it helps someone else.
The code on the webpage was:
< object classid="clsid
27CDB6E-AE6D-11cf-96B8-444553540000" xcodebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab" height="315" width="640" >
< param name="Movie" value="total_mowers_products.swf" >
< param name="Quality" value="high" >< embed type="application/x-shockwave-flash" src="https://www.dnncreative.com/Portals/0/main.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" height="315" width="640" >< / object>
I changed it to:
< embed type="application/x-shockwave-flash" src="https://www.dnncreative.com/Portals/0/total_mowers_products.swf" quality="high" pluginspage="http://www.macromedia.com/go/getflashplayer" height="315" width="640" >