Open CCC (Catalyst Control Center) and check in the "Information Center" tab under "Graphics Software"
There should be one line that contains something like this:
Catalyst® Version 0X.XX
That will tell you what version you have installed.
Then, to find the new driver you just go to http://ati.amd.com/support/driver.HTML
and select the appropriate set of drivers, download and install.
Or, go to your laptop manufacturer and see if they have a newer set of drivers on their support site. Sometimes the official mobility drivers doesn't work with all laptop configurations.
Cooler Master HAF 932 Full Tower : Corsair 750HX Modular PSU : Asus Crosshair III Formula : Phenom II X4 965 125W
Corsair H-50 CPU Cooler : Corsair Dominator GT DDR3 1600 7-7-7-20-1T 2x2GB : WD Caviar Black 32MB 640GB : Sapphire HD5870 Vapor-X
Antec Fusion Remote Black : ASUS M4A785TD-M EVO : Athlon II X2 240e : Crucial BallistiX 1600 2GB x2
Corsair 400W : Sapphire Radeon HD6850 : Lite-On iHBS112 BD-Burner : WD Caviar Green 500 GB