how to set Approve/Disapprove based on roles??

how to set Approve/Disapprove based on roles??

Hi,

I have created function for approve n disapproved and also set in custom action in report.

But I'm looking for, this approval should be visible based on roles.

I have declared three roles: Manager, CEO and User.

So, I just want to enable this approval only for the CEO or Manager.

Can any one plz help me.


Thanks