This may sound like a stupid question, but if I place more than one flash movie on a page, do I have to include the ExpressInstall command for each flash movie or is it sufficient to just add it to the first instance where I am using SWFObject script on the page?
My opinion is that it is only 1 line of code and won't be noticable to the user time wise to do the check on all, so add them to all files. This way if ever you change your page you can gaurentee that each swfObject definition will work stand alone.