javascript event this

http://www.quirksmode.org/js/this.html

http://www.cnblogs.com/ruxpinsp1/archive/2008/04/20/1162463.html

http://www.yaosansi.com/post/1263.html

http://www.blogjava.net/tangzurui/archive/2008/10/28/237054.html

http://www.cnblogs.com/felix2007/archive/2007/03/21/682670.html