1$("#dialog_box").dialog({
2    autoOpen: false,
3    modal: true,
4    resizable: false,
5    buttons: [{
6        text: "Ok",
7        "id": "btnOk",
8        click: function () {
9            //okCallback();
10        },
11
12    }, {
13        text: "Cancel",
14        click: function () {
15            //cancelCallback();
16        },
17    }],
18    close: function () {
19        //do something
20    }
21});
22
23var newLabel = "Updated Label";
24$("#btnOk").html('<span class="ui-button-text">'+ newLabel +'</span>')