Stocks opened higher Monday but got slammed after the dollar rebounded. The NYSE composite tumbled 1.5%, the S&P 500 1.2%, the Dow 1% and the Nasdaq 0.6%. Volume was higher on the NYSE and lower on the Nasdaq. Sohu.com (SOHU)plunged 11.43, or 16%, to 59.92 as it slid below its 50-day moving average. The China-based company topped Q3 profit estimates but warned current-quarter revenue would come in below expectations. Its Changyou.com (CYOU) gaming