Problem directing old dynamic urls to new static ones

I recently changed my site so that it now uses static urls as opposed to dynamic ones. I've been trying to figure out a way within .htaccess to direct the old dynamic urls to the new static ones. The problem I have is that there really is no pattern that corresponds the old to the new so I don't think I can use a mod_rewrite. I'm trying to use just a standard 301 redirect but I can't figure out how to do it with dynamic urls. Here's an example of the urls:

old: http://www.mysite.com/productpage.php?productid=1&productname=widget1&catname=bluewidgets

new: http://www.mysite.com/my-widgets-page.php

Anyone have any ideas?

 

If productpage.php doesn't actually exist, you could use

<?
switch($_GET['productid'])
{
case 1 :
header("location: http://www.location.of.product1.php");
break;

case 2:
header("location: http://www.location.of.product2.php");
break;
}
?>

PHP:

Does that page exist ?

 

I don't currently have the page up but I can add it back to the site. The code you included would be added to productpage.php correct? I would basically have a different case statement for each new url?

 

This worked like a charm krakjoe. Thanks so much!