Power RGB LED help!

I wonder if anyone could advise me as a newbie (blush)!

I have just bought a self contained RGB controller with PWM'd outputs:

http://www.dotlight.de/shop/product_info.php/cPath/263_266/products_id/828?osCsid=c99bcde36c901d8ae197dcf038b315d3

What I want is to use this for the lighting in a vehicle (12 - 14.6V). The LEDs I have looked at and bought one for testing are:

http://cgi.ebay.com/High-brightness-1-pcs-3W-RGB-full-color-LED_W0QQitemZ230093694925QQihZ013QQcategoryZ66954QQrdZ1QQcmdZViewItem

Now - the vehicle has a removable rear cabin leaving only the front cabin LEDs connected at times. I will need say 6 - 7 LEDs for the rear cabin and 2 - 4 for the front cabin depending on eventual light output.

Should I drive these LEDs with constant current drivers for each colour? Will they work with the PWM output of the controller?

I understand switched regulator type circuits won't work with the PWM output?

I guess I would need several contant current regulators to power the array but am struggling on how many and how best to connect them?!?

Thanks in advance!

Chris.

Picture of Power RGB LED help!