JavaScript 图片上传预览效果
需要用到图片上传前的预览效果

找了好久......
http://www.uploadify.com/download/
http://www.cnblogs.com/boychenney/archive/2011/10/08/2203036.html
http://www.cnblogs.com/oec2003/archive/2010/01/06/1640027.html

http://www.cnblogs.com/cloudgamer/archive/2009/12/22/ImagePreview.html

http://hi.baidu.com/%B7%E7%BE%B0%D2%BB%C2%B7%C3%C0%BA%C3/blog/item/5729103b79e5c4ccd56225ab.html

浏览器的兼容是个很大的问题

以下ie8,测试通过,但是ff,chrome不行