How can we prevent the owner of record from being Approve or Reject the submitted record?

Thanks.

Hi,

I want tocreate an approval process for the case object based upon Amount and have hierarchyfields ( Manager , Director, Product manager ) in User

Now I wantApproval process like

1. ifamount < 1000   = approval – Manager

2. Amount> 1000     =  approval – Director

3. Amount  = 10000   =  approval – Product Manger

I am unableto created approval process for this scenario as for #2 and #3 there is nooption like (Director and Product manger)

Please letme know if any one has any idea.

--Deep