I want to create a code that will alow my forum members to input keywords to set an email alert.
The user inputs keywords and submits their email address.
The code searches titles of threads for a match for those keywords, (posted after submit) if a match is found the user is sent an email from
thread poster [do not reply etc] (and therefore posters mail client)? containing a link to the thread/s.

How can this be done with javascript or/and remote php?
:?:

It can be done with PHP. It'll be (quite) alot of PHP.

Searching for keywords would be done best at the point where your forum program receives and saves posts; you can check any new post against keywords for subscribers and issue mail to people who are interested there and then.

you mean at the point of submit?

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