Getting on at American odds

i'm trying to get a bet on a English horse running later at santa anita. I think it will be bigger in the American betting and want to back it at the odds it returns at over there. when I try to back it with the online bookie it gives me 3 options take the odds they are offering now or 'SP' or WIN DIV' i'm worried 'SP' is the industry sp and i'm not sure what they mean exactly by 'WIN DIV' can anyone help. thanks.