setting aside whether or not you are the proper syntax to display flash files to a wide range of browsers…
Examine this, one of the files that you have linked to:
https://guitartipsonline.com/newsletter/sounds/ffirstpositionfinal.swf
I can load that .swf in ie6 and it plays.
I can load that .swf in ff 2.0.0.14 and it does not play.
if those are your swf files, then you need to examine the .swf source.
if theyre not, you may be sol, besides which, if theyre not your files, hotlinking as you have is frowned upon. youre using their bandwidth to display content on your site. bad, bad, very bad.