Shrimp And Crab Mousse

• 1 gelatin (envelope unflavored)
• 240 ml mayonnaise
• 200 gr crab
• 190 gr tomatoes pureed
• 230 ml cream cheese
• 80 ml water (cold)
• 75 gr celery (finely chopped)
• 2 ml lemon juice
• 1 ml salt tabasco sauce