Help:

Press the portrait to select a different pet. Pet's differ both in abilities available, armor, health and damage.
Press the level button to select a different pet level. Choosing a different pet level will tell the number of training points- and ability ranks available for your pet's level.

Pet Resources:

Sourcecode is available here.
Original graphics by Blizzard Entertainment (gracefully borrowed for this application .)
This application has only been verified to work with the latest versions of Firefox, Internet Explorer, Opera and Safari (as of late 2006.)
For Opera users: This application requires the use of the right mouse button. By default, Opera has disabled right mouse button clicks for Javascript. To re-enable this you need to adjust the following: 'Tools->Preferences->Advanced->Content->JavascriptOptions' and enable 'Allow Scripts To Recieve Right Clicks'.
During the development of this application the following resources was of great help: Webdeveloper (Object-Oriented Javascript), W3Schools (HTML and CSS in general), Sun: AJAX in Action (events with objects), Aleksandar Vacic: Effect of z-index value to positioned elements (a good explaination about CSS z-indexing), A List Apart: Cross-Browser Variable Opacity with PNG (on transparency in PNG images.)

7.sep.2008 Added information about the new expansion.
19.jan.2008 Dash ability missing from Raptor. Thanks to Mitchell Hancock for spotting the error.
22.aug.2007 Numbering error on Scorpid Poision level 5. Thanks to Shinoda on Kilrogg (US).
24.may.2007 Added new Avoidance and Cobra Reflexes skill.
7.may.2007 Fixed cost for Lightning Breath. Level 70 now default. Thanks to aelfric.
27.april.2007 Removed Bite from Sporebat. Thanks to Durogar.