struts menu bar

hi
     im  working on projrct
           i need help 
       code for menubar expansion (java script or struts)

for ex
recruitment
profile
abc
xyz
        are there on left menu,
i want code for,if i click on recruitment  i want 4 names should display below 
this and those should be linked for perticular pages and until unless i click 
once again recruitment that menu be like that only.
for ex
  recruitment 
     a.jsp
     b.jsp
        if i click a.jsp it should go to that page

my menu should look like thie
recruitment
    a.jsp
    b.jsp

profile
abc
xyz

any body plz help me ,its urgent



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