While the major indexes were mixed Monday, most top-rated stocks in the IBD Research Tables fell in weak volume. Two leaders, however, attracted strong volume as they headed in opposite directions. China-based search engine operator Baidu (BIDU) jumped as much as 14% intraday in huge volume. But it gave up much of its gain, settling for a 5% gain of 26.60 to 576.84. Baidu got a boost on fresh reports that Google (GOOG) would be leaving China.