I spent ages trawling the internet trying to find easy ways to change the little links that Drupal attaches to each node ('Add new comment') and either remove them, change them to icons or shuffle the order. Options available include:

In the event of an HTTP 404 error ("Page not found") this PHP snippet will render a site search form, but will take keywords from the user's erroneous URL and pre-populate.

Create a new node (node/add/page), and ensure you can enter PHP code in your page body (check input filters).

Insert the following code into the body of your new page: