Too difficult. I mean, Jesus was "dead" for 3 days, sealed in a cave (or tomb, by this guy named Joseph of Arimathea (sp?) who donated it). He would have died of asphyxiation had normal body activity gone on, and, if you believe the religious iconography...well, actually, probably not. Crucifixion didn't kill by the blood, but by eventual dehydration and starvation--ouch. So it's possible that *if* he had resurrected, the blood loss wouldn't be so severe. But no, medically speaking, you can't bring someone back to life after three days. But, due to the fact he was put in a tomb, chances are after three days his body would not have rotted significantly.
And, to all the naysayers above, everything can be explained by science. Any miracles and occurrences outside the realm of known science are just the "God is in the gaps". Whether there is a God or not, I digress.