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Is that a Intel MAC or Power PC MAC ?(Click on Apple button -> About this MAC)
If your Mac is PowerPC, and odds are with 10.4 that it is (there were very few Intel Macs that were sold with 10.4 and most upgraded to 10.5 or 10.6)... you've unfortunately reached the end of the road as far as Flash is concerned.
If it IS an Intel machine, you can upgrade to OS 10.6 through Apple for just $19.99
Model Name: MacBook Pro 15"
Model Identifier: MacBookPro2,2
Processor Name: Intel Core 2 Duo
Processor Speed: 2.33 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache (per processor): 4 MB
Memory: 3 GB
Bus Speed: 667 MHz
Boot ROM Version: MBP22.00A5.B07
SMC Version: 1.12f5
Serial Number: W87161CRW0H
Sudden Motion Sensor:
I'd spend the $20 to get Snow Leopard, and maybe another $65 to bump it up to 4Gb RAM or even 6 if it'll handle it. My 13" MPB ran great with 4Gb and 10.6.
I am not 100% sure about this, you may try to Install Adobe Flash Player 10.3
Adobe Flash Player 10.3 : http://download.macromedia.com/pub/flashplayer/installers/archive/fp_10.3.183.90_archive.d mg
Download the installer
Close all the browser windows (Safari)
Run the installer