Multiple map pin locations - repost 2

I have a map pin display using the Google Maps API on web pages showing radio transmitter locations with data imported from a mySQL database table. Sample map can be found at [login to view URL] The script currently only allows one pin per site but there are often up to 4 stations at a particular location. I need someone to do a script that will allow data at a location to be expanded to be able to select from multiple data sets at a particular location. Ideally also show different pin types depending on whether it is a multiple site or a single site, or depending on the contents of a specified field in the database. This project would suit someone with good knowledge and experience of working with the Google Maps API. Solution should be in html/php