Driving RGB LEDs

hi,
I want to drive 4 RGB LEDs with PIC16F877A. but i have not any knowledge about these LEDs. how is that schematic and how can i create colores?

sory for my english.
thanks

You can mix the colours using PWM to control the brightness of each coloured led.

There is a very good web site that has some RGB projects and full explanation that should help you here :
http://picprojects.org.uk/projects/picprojects.htm