comparing two lists and returning "position"

[hiro]

Hi there, I have a 2 lists.. for simplicities sake lets say the are:

l1 = [ 'abc' 'ghi' 'mno' ]

l2 = [ 'abc' 'def' 'ghi' 'jkl 'mno' 'pqr']

what I need to do is compare l1 against l2 and return the "position"
of where each object in l1 is in l2

ie: pos = 0, 2, 4


Thanks in advance, -h