If you head over to Nathaniel Bailey you can find a brand spanking new custom, smart 404 script which has been built with some quality code to offer one of the best smart 404 scripts I have seen in a long time!
Nath’s Custom 404 Script has been coded to give your visitors different and informative messages depending on how they find any 404 page on your site, be its from a dead link on site, a site that dont exist from a site linking to you, or any other way you could possible think of finding a 404 page, Nath’s Smart 404 Script has it covered!
Nath’s Custom 404 Script has even been built ready to use the google onsite custom search just by entering your own unique code from google.com/cse (instructions and readme are all included with the script to do this correctly first time). But… Not only has the smart 404 script been built to use google custom search for your on site search, you can also add and use any custom on site search engine you like as the script has been fully prepared and tested for that too! And to top it offer the code also exists to use the wordpress standard search box, all you have to do is comment and uncomment the search option you wish to activate.
Along with giving your visitors an option to search your site Nath’s Custom 404 Script will also list related pages for your visitor to click on to. These pages are pulled from your sites server using the url and keywords the visitor used as the 404 page loads.
And finally to top it all off, Naths Smart 404 Script offers a clean, professional and user friendly design with some fun images to make your lost visitor small and keep faith in your site 
For me information, a full list of features and test url’s please head over to Naths Smart 404 Script page.
All the features listed above and on NathanielBailey.co.uk are fully editable/customizable by anyone due to having been coding all with simply php in one single file for easy access and use even by those with little to no coding skills/knowledge.
If you do need a helping hand with customizing the script please contact Nathaniel at the links above to arrange for some help with getting the changes done that you need. Alternatively you could take a look at the code and try your self as it really is simply to edit as both the php and css files have been commented to tell you whats doing what, and you will also find a details readme when you download the script (download links are on NathanielBailey.co.uk)
