jQuery 1.6.1 and fix for some small bugs that popped up while testing it,...

jQuery 1.6.1 and fix for some small bugs that popped up while testing it, props JDTrower, fixes #17311

git-svn-id: https://core.svn.wordpress.org/trunk@17907 1a063a9b-81f0-0310-95a4-ce76da25c4cd