We can change the value of an object’s field on button click by using javascript like this (and this will also reload the page):
{
!REQUIRESCRIPT("/soap/ajax/29.0/connection.js")
}
var rec = new sforce.SObject("Contact");
rec.Id = "{!Contact.Id}";
rec.IsActive= 'true’;
var result = sforce.connection.update([rec]);
window.location.reload();
In this code we are assuming that we want to change the status of the Contact object. You can associate this code to a button in Setup area
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