I know that JavaScript is difficult to parse w/o a full-
blown javascript engine, however I've run across a few 
sites that work to detect whether or not flash (or at least 
a specific version of flash) is installed and use 
document.write() to spit out the appropriate object/embed 
tags for flash, or img tags for browsers that aren't 
capable.

Any chance that the flash URL detection code can be 
included inside of javascript that does document.write()?
-j