Php 5.3 to 5.2

I am desperetly trying to put php 5.3 to 5.2, main reason is that I have some systems that dont work well with 5.2 There is a nice tutorial here

http://www.rocko.me/?p=213

but it doesnt help as seems that this repositories dont exsist any more?

Also i dont understand should i delete all data in "sources.list" or just add this old ones. Seems adding old ones doesnt help much and i still get installed 5.3, either because its wrong or there aren't any of them?