Can one of you Wordpress Gurus give me some help please?

I developed a Wordpress site on:

It was a stand-alone version of Wordpress and now the site is nearing completion, I have moved it to its own domain.

It now resides at:

I changed the DB settings in wp-config and all was fine. The homepage was on the correct URL and all other pages were still pointing to the development URL, so I employed the URL fix thus:


Edit theme functions.php

Now only the homepage works and the links throw up a 500 error.

Any idea on how best to make this move work?

There used to be a find and replace plug-in for the DB, but I can't find that any more.