JavaScript - How to expand and collapse asp treeview in javascript ?

hi

  I need sample code for expand and collapse for asp treeview ,i use treeview with enable checkbox,if i click the parent node checkbox it expand all child node ,if i uncheck the parent node it collapse the child node,pls reply asap.

Note : not use "+" symbol for expand and collapse,enable the checkbox ture in treeview,using that checkbox only expand and collapse the nodes.In JavaScriipt

Thanx

  Aravind