Fix google maps API v2 to API 3 code so it works

I have a simple google maps API that was API v2 to place a marker on the google map from the user location from my sites DB. After the Google maps API v2 to version 3 update I cannot get the map to show on my page. This is a simple fix for someone I'm sure. I have corrected the API v2 to V3 code myself but need someone to fix what I cannot! It was working fine before on V2. Can supply you with the code that needs fixing. You correct it and then once its working ok, get paid for the quick 5-10 minute job. I have a new V3 API key already too.