There is markup available through the SWFObject documentation that describes a method of providing alternative content when working with the SWFObject.js. Follow the link to http://code.google.com/p/swfobject/wiki/documentation and review Step 1. There is also a second section further down describing an alternative method which uses the SWF dynamic method, under the heading “How to embed Flash Player content using SWFObject dynamic publishing” which might also work for you.