Flash Detection: Adding Custom Links

I’m using just the basic built-in flash detection that you turn on in the Publish settings. I would like to add a personalized notice, like “Your computer requires Flash Player 8. To proceed, click here for the free download.” Then another link with “If you would like to continue to an HTML version, click here.” I have been changing this in Dreamweaver and it just doesn’t show up when I uninstall flash and test it out. Instead all I get is the basic “Get Flash” link and the “alternate content” sentence. What am I doing wrong? I do see a bunch of CSS I don’t understand with a “Get Flash” link, but I don’t know how to customize CSS with new centered lines and such. Thanks for your help!