I apologise for any confusion!
Here are a few other things that may help you switch from using Irfanview to using iPhoto.
http://www.apple.com/support/iphoto/
http://www.apple.com/support/iphoto/hottips/
http://www.macworld.com/2005/07/features/photosprepare/index.php?pf=1
I'm not sure exactly what your looking for in Toolbox maybe try Softpedia support?
http://mac.softpedia.com/get/Multimedia/Toybox.shtml
If your looking for somewhere to add lettering, captions and overlay images to your photos give Comic Life a try!
17" iMac Intel Core Duo 1.5GB Ram Mac OS X (10.4.9) Maxtor 300GB FireWire Creative Inspire 2.1 2G Nano