IE 7 Add-on - Intercept URL address

I would like an IE 7 Add-on to intercept the URL address when a user enters it into the address bar.? Once the URL has been entered it will be checked against a small local database (MS Access mdb) on the clients PC to check if the requested web address is in the database, if it is then I would like another webpage to be displayed (URL redirection) instead of the origional requested site.? This is **NOT** for any scam or phishing or any other annoying reason, it is a legitimate reason. Somewhere in IE (ideally on the IE status bar) there should be some indication that the requested website is in the database of URl's. Thanks