PHP DBTreeView is a useful Ajax web control to display a treeview. This component is designed to extract dynamic content from database, so that the tree content is updated step by step. You don't need to know JavaScript to use this tool. (R. Cardon)
phpAjaxTags is a port to PHP from advanced java tag library "AjaxTags" (ajaxtags.sourceforge.net). To install - just extract zip file into Your root www dir. On-line demo http://www.2al.pl/phpAjaxTags/