tree structure in jsp

[aarti patil]

I want to know how to construct a tree structure on jsp page?
ex:the dir structure is testproj(proj)->spA,spB(subproj)
spA->sp1,sp2(subproj)
spB->sp3,sp4,(subproj)
i.e project containig subproject,subprojects containing their subproject etc.
i wnt to show this in the form of tree with respective links,so that no need to click on new page each time, to view subproj of a project.
User will able to see project with its subproject,n so on,as told above.
And on the same page he should able to click on the proj or subproject he wnt.
pl,help regarding to this topic