Probability of a RF in Omaha

[BigBluffer]

This was asked a little while ago in B&M and the OP was chastised for posting in the wrong forum. [img]/images/graemlins/smile.gif[/img]

Playing Omaha, given that you are dealt 2 to a royal, what are the odds of completing the royal?

Also, before the deal, what are the odd of making a royal in Omaha? Clearly, these odds will be much higher than in the first situation.