For some time i was searching for a method to place DHTML layers over the Flash objects, yet i couldn’t find an article regarding this matter or rather i didn’t spend much time sweeping the NET regarding this. How ever For a web site I was doing recently I had to use the lightbox.js effect But again I met the problem of laying the DHTML layer over my flash content, Luckily in the troubleshooting part in the lightbox web page i found the path directing to the Adobe official site where this problem is wildly discussed.
As it says “Use the WMODE parameter to allow layering of Flash content with DHTML layers. The WMODE parameter can be ‘window’ (default), ‘opaque’, or ‘transparent’. Using a WMODE value of ‘opaque’ or ‘transparent’ will prevent a Flash movie from playing in the topmost layer and allow you to adjust the layering of the movie within other layers of the HTML document.”
You can gather more details at http://www.adobe.com/cfusion/knowledgebase/index.cfm?id=tn_15523