[pmwiki-users] How to use embed code

[The Editor]

I have a similar situation where I need to include a page in my site
with a button that opens a chat window using the window.open command
(javascript).  I tried the suggestion of putting it into a markup in
my config file but it killed my site.  Must be some syntax error. 
Maybe someone can help me to spot it?

Markup('chatbox', 'directive',
     '/\\(:chat://)/',
     Keep("<input type='button' value=' Chat Now! '
onclick=/"window.open('http://www.chatzy.com/chatroom','chat','width=675,height=500,resizable=no,scrollbars=no,
toolbar=no,location=no,directories=no,status=no,menubar=no,
coyphistory=no')/"/>"));

I think I must not have escaped the quote marks in the text properly. 
By the way, not to ask a dumb question but what language is this? 
PHP?

Caveman