my own plugin for serendipity released
you can take a look at "Bookmark" section in my weblog and NOW you can download it from here -> download all files and directories, rename the phps file to php then create a directory in the plugins and rename it to serendipity_plugin_links and copy all these files into that...
i used dTree JavaScript tree menu to develop this plugin, and................... thanks to Garvin Hicking for his kind helps.
have fun