new on-demand code

Quietly removed the embedded XSPF player from the on-demand pages, replacing it with the mp3player from http://www.jeroenwijering.com/?item=Flash_MP3_Player opening in a new window using a simple target="_blank" In replacing the old pages' code, learnt some regular expression syntax from KWrite's regular expression editor -
1. Reg Exps have to be only on a single line - end of line symbol $ terminates the regexp.
2. object.*$ means object followed by any characters till end of line.