From Yahoo! News - Ailing Pope John Paul II Skips Mass:
"He had not been expected to preside at the Holy Thursday Mass, and his stand-in, Cardinal Giovanni Battista Re, read a brief greeting from the pope containing assurances he was following the service on television.
In his homily, the Italian cardinal thanked the pope 'for the testimony that he continues to give us with his example of serene abandonment to God.' "