Getting the accessed url from 404.shtml

[madcamel]

Hi all,
Lets say someone tries to access mydomain.com/page.html, when page.html doesn't exist on mydomain.com.

Currently I have a 404.shtml which catches all these errors and redirects them to "/".

Is there a way for the 404.shtml file to know which url was accessed ?
Basically what I'm looking for is that if someone wants mydomain.com/carrots.html, I will redirect him to mydomain.com/search.php?term=carrots.

Thanks

EDIT: nm .. I think I can do it with mod rewrite