If your browser clients are running Windows with ActiveState Perl installed then you can run PerlScript.

Perl script is a client-side scripting language similar to Javascript and VBScript. You then:

1. write a function in Perl;
2. surround the Perl function with <script> tags;
3. include the script in the HTML that the browser downloads; and
4. create an HTML button and attach the Perl function to the button's onClick event handler.

Here is a link to ActiveState's PerlScript page.