Webplayer loads a scene via JavaScript

Is it possible to make an existing instance of the web-player loads another scene by file-name? Because of scalability issues, I cannot package all the scenes into the webplayer, as there will be new scenes continually added to the application.

Yes, it is possible to download and load new scenes dynamically.

What you need to do is to package your scenes as AssetBundles, download those using the WWW class, and then you can load the levels using Application.LoadLevel/LoadLevelAdditive.

This sample should do what you want.