Tiles and collision

Hi, I'm currently working on a clone of mega bomberman, and i have got the basic scene to display, but i dont have a clue on how to apply collision to certain tiles and not on others. i'm using the data command to layout the scene, and i need certain values used in the data command to have collision applied.
please can someone help.
thanks.
p.s. please say if this does not make any sense.