What does the ending mean?

Rating: 8/10 (27 June 2005)

I simply don't understand the ending! Has Jack's spirit stayed in the Hotel since the party from 1921? This little picture tells that he was there back in 1921 alright, but does it mean, that he has always been there or WTF? It's so unclear to me... I saw it with some friends and we discussed the fact, that Jack Torrance could be a ghost from the past party or something, put what is the idea with the party thing? Great film and all, but I'm not entirely sure about these things, so if someone has a descent opinion to my problem, please be my guest and post...... and no, I DON'T WANT TO READ THE DAMN BOOK JUST BECAUSE THAT'll EKSPLAIN A THING OR TWO!!! This is a movie script adapted from a book, which doesn't mean that it's supposed to be 100% similar to each other...