So what's happening is that there's that error, and that's getting sent to the web server (to be sent to the browser) first. But the web server must get valid http headers first. so two things to fix:

• 1) this line is causing the error (i think you meant to escape the '@', not the 'd'):

  print "Maintained by <a href=\"mailto:admin@\domain.net\"><font face=\
  +"arial,helvetica\" size=3>
  admin</a></font>\n";
  [download]

• 2) You need to print HTTP headers before you start printing your content (the html code). look at the CGI docs for how to do this (alsoo look in the CGI section of the Tutorials for more good stuff)

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