use CGI;
  use URI::Escape;

  # here put code that prints out the page header, etc.

  my $secondurl = 'http://www.myothersite.com/myotherwebapp2/foo.asp?param=1&param=3';
  my $initialurl = 'http://www.mysite.com/mywebapp1/dosomething?' . 'url=' . uri_escape($secondurl);
  print '<a href="',
        CGI::escapeHTML($initialurl),
        '">launch mywebapp</a>';

  # code that does that does the page footer