Tomb Raider: Legend (PS2), Help is needed?

-I don't know what level I'm on in it. But I'm pretty sure it's not far at all because I just started it today. I'm to this place in a tomb where there's water and crates. there's one crate on the entrance platform and two down on the bottom level where there's like 3 inches of water. I need to get those two to where the one on the entrance platform is and push them onto these buttons to open the next entrance to move on. I've been trying different tactics yet none of them are working to get them up onto that platform. Can someone help me? I'll give 5 stars to the person that helps the best. Make the clear and possibly in steps if you will, please. Note: I have tried the see-saw thing with the crates and they only go on top of the other, not onto the platform. :/If you need a walk through go to tombraiderchronicles.com and you will find walktrhoughs for every tomb raider game, it will also tell you where to find secrets and stuff