Water leak

[SIZE=4]This dishwasher leaks onto the floor about every other time we wash dishes. We put a rag under the machine to catch the water. I pull the rag after every load and it seems only that it is wet every other time. Could this be the door seal? I have laid on the floor and watched the places it could leak and have seen nothing, no drips or leaks of any type. Any suggestions?[/SIZE]