layer control on off

my wanted routine , that is layer control routine
1. i select 1 object
2. then , all layer is hidden
3. selected object layer is on only

for i = 0 to (layermanager.count - 1) do

( x = layermanager.getlayer i
x.on = false

)
selection[1].layer.ishidden = false

is routine error ?
that routine did not work .