I understand what is it you want to do..and I know how to do it.. (normally) (like your links)..

however using ExternalInterface calls a function in the wrapper (ie: HTML page).. and since you dont have any control to put the function in there..that wont work...

Im going to go out on a limb here and say this cant be done without access to the HTML page... either by re-writeing the <DIV> / embed code for the .swf or the CSS for the HTML page that contains the .swf