IE6功能丧失修复
IE6 PNG图片半透明
jquery.pngFix.js http://jquery.andreaseberhard.de/pngFix/
Unit PNG Fix http://labs.unitinteractive.com/unitpngfix.php
Supersleight jQuery Plugin for Transparent PNGs in IE6 http://allinthehead.com/retro/338/supersleight-jquery-plugin