Open VisualForce page on selection of opportuinuty recordtype

Hi Forum members

If i have 5 opportunity recordtypee.
So on creting of new opp record,when user selects the recordtype i want that if reordtype seleted is the 5th one it should be redirected to a VF page, and in all other case it redirects t same conventional opp edit page

Please comment

Thanks