Fox's American Idol continued to dominate the ratings Tuesday night, posting a huge 16.7 rating and a 25 share. Nevertheless that was down 12 percent from the comparable second-week numbers a year ago when Idol posted a 19.0/28. Although a repeat, Fox's House kept the network in first place place at 9:00 p.m. with a 9.3/14. NBC took over first place at 10:00 p.m. (Fox does not air programs in the 10:00 p.m. hour) with NBC's Law And Order taking a commanding lead over its rivals with a 9.0/15.