png24第二种方法
Signed-off-by: zuoyu <zuoyu.ht@taobao.com>
Merge branch 'master' of https://github.com/hutaoer/hutaoer.github.com

Conflicts:
	templates/test/IE6_png24_bug.html

Signed-off-by: zuoyu <zuoyu.ht@taobao.com>