Why take a chance on compatibility with generic RAM?
For starters, that Tiger Direct memory in the link is a 184-pin desktop DIMM and won't fit your iBook nohow.
Choose a reputable dealer who tests and guarantees compatibility with your model Mac. Some of the MR posters like Crucial, OWC and RAMjet, I like Data Memory Systems. They are real Mac people and have been in business for 17 years.
$155 for a Gb (the correct RAM for your machine)
http://www.datamem.com/viewcat.asp_Q_C_E_1152
Thanks
Trevor
CanadaRAM.com