Lara Croft WII game...HELP!?

Heyy, I'm currently playing lara croft anniversary and i've hit a bit of a snag. I can't get past this one area: when lara has just gone past the path with arrows shooting at her, she then gets to a large door. She steps on a large on and one of the bolts opens. She then climbs up to a path, wriggles along a ledge and opens a second bolt. She goes along the path and opens a few more bolts. I know this sounds really complicated but i'm going off the game because I can't get paqst this level atall! please help!