on PNG file format, is not very detailed, but the Chinese version of .. if better, Please find English-

PNG文件结构分析.htm
PNG文件结构分析_files
.....................\1.gif
.....................\200504.htm




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.....................\ad_userbotjs.htm
.....................\ad_usercommentjs.htm
.....................\ad_userlinksjs.htm
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.....................\commentedit.htm
.....................\count(1).htm
.....................\count(2).htm
.....................\count.htm
.....................\login.htm
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.....................\main.js
.....................\OblogUserDefault31.css
.....................\oblog_powered.gif
.....................\show_blogname.htm
.....................\show_comment.htm
.....................\show_info.htm
.....................\show_links.htm
.....................\show_newblog.htm
.....................\show_newmessage.htm
.....................\show_placard.htm
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.....................\show_subject.htm
.....................\xml.gif

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