Need direction on mass find/replacement in HTML files

[KevinUT]

Hello Folks:

I want to globally change the following: <a href="http://
www.mysite.org/?page=contacts"><font color="#269BD5">

into: <a href="pages/contacts.htm"><font color="#269BD5">

You'll notice that the match would be http://www.mysite.org/?page= but
I also need to add a ".htm" to the end of "contacts" so it becomes
"contacts.htm" This part of the URL is variable, so how can I use a
combination of Python and/or a regular expression to replace the match
the above and also add a ".htm" to the end of that variable part?

Here are a few dummy URLs for example so you can see the pattern and
the variable too.

<a href="http://www.mysite.org/?page=newsletter"><font
color="#269BD5">

change to: <a href="pages/newsletter.htm"><font color="#269BD5">

<a href="http://www.mysite.org/?page=faq">

change to: <a href="pages/faq.htm">

So, again the script needs to replace all the full absolute URL links
with nothing and replace the PHP "?page=" with just the variable page
name (i.e. contacts) plus the ".htm"

Is there a combination of Python code and/or regex that can do this?
Any help would be greatly appreciated!

Kevin