websitings

Greetings, My website displays dynamic content from urls like this: [a href=\"http://www.mydomain.com/index.php?f=whatever\" target=\"_blank\"]http://www.mydomain.com/index.php?f=whatever[/a] Is it possible to modify the htaccess so that if a url does not contain ?f a header 404 message instead of a 200 success could be presented to the agent requesting the url. Thanks for any assistance

Greetings, My website displays dynamic content from urls like this: [a href=\"http://www.mydomain.com/index.php?f=whatever\" target=\"_blank\"]http://www.mydomain.com/index.php?f=whatever[/a] Is it possible to modify the htaccess so that if a url does not contain ?f a header 404 message instead of a 200 success could be presented to the agent requesting the url. Thanks for any assistance

I am seeking guidance for the following challenge. If someone visits my website using a non existant page url or may just have typed incorrectly in the browser location. For example they may have typed: [a href=\"http://www.mydomain.com/a/nonexistant\" target=\"_blank\"]http://www.mydomain.com/a/nonexistant[/a] I would like the browser to maintain what they have typed in the address box but I would like to display a page which can handle a php script to display a message based on what they entered for the url. I would have no problem writing the script to display the message but I am struggling on working out how to maintain the url which is important to me. I can work out how to use htaccess for a 404 redirect but that's not what I want I assume it would be using some 404 handler but can't work it out myself. Any help greatly appreciated.