I have an untested way to go about your problem. I was hoping to produce a tutorial about it in the near future if successful. It requires the following:
-That your game be played through an iframe
-All your games are hosted at the same domain
-All games are the same dimension
You first load up the url, which loades up an iframe with a 'Menu' project. Then from inside the project, the player selects the game they want to play. This creates an event to change the url (I.e. change webpage) in the same window as the C2 game (Iframes are like a layer above another webpage). You remain on the same webpage (due to iframe), but the webpage within the iframe changes. If this works, the result is, your first project acts like a menu.
Hope that helps,