Spoiler for Read:
You can get them rather easily, if you go into npc_names it will have the id's then two animation ids for example:
90 would be the npc id. 5483 would be the walking animation and 5481 would be the standing animation. Too get the attack animation just add 1 or two. for example 5484 or 5485. Just keep trying until you get it.Code:90, 70, 5483, 5481, Skeleton
If you don't have Npc_names here is mine (leeched from eclipse 639):
Hope it helped.