Normal people think of trees as those green living things with branches and leaves. Computer Programmers think of trees as something completely different. (although computer programmers should be considered normal people too).
I made this mult-tree webpage for using jQuery and the plugin treeTable. Using JSON data from a webservice, I generate a table using the old <table><tr><td> tags with their corresponding parent ids. Then I plug in the treeTable — and POOOOOF — the tree appears. It’s that easy.