Hello, please allow me to chime in here. I am the web site administrator of the web site that Jeff Sundin is referring to. First of all he stated that we have duplicate sites. We do not.
Here is what we have.
One physical web server and ip address.
We have 4 domain names registered with network solutions
They are mdiplastic.com, mdiplastics.com, mdiplastic.org and mdiplastics.org and they all point to the same web server address.
We use IIS and host headers so all 4 of these domain names point to the same folder on our web server. There is only one folder or website for plastics. There is no duplicate. This is the folder that Jeff has access to update.

We also have our corporate web site on the same server. The domain name is mdi.org
Again we use IIS with a host header that directs mdi.org to a different folder or Web Site "if you will" on the same server.

We are willing to make whetever modifications are necessary but want to be sure you were accurately informed on our setup.