Squirrelmail front end for multiple mail servers

Basically .. I have 6 servers all running identical squirrelmail setups. We want to have a webmail link from our homepage, but the problem is different domains are on different servers. We're looking for someone to write a script that look for the resolution of the domain and forward the login request to the appropriate server. This would also need to be locked to only work for our servers/ip's. Anyone think they can handle this project?