jQuery & jQueryUI Base

HTML

<link rel="stylesheet" href="http://ajax.microsoft.com/ajax/jquery.ui/1.8.7/themes/black-tie/jquery-ui.css">
<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.8.7/jquery-ui.min.js"></script>
<div id="dialog">
    Test 123123123
</div>

CSS

.ui-dialog button.custom { background: orange }

JavaScript

$("#dialog").dialog({
    buttons: {
        'Confirm': function() {
            //do something
            $(this).dialog('close');
        },
        'Cancel': function() {
            $(this).dialog('close');
        }
    },
    create:function () {
        $(this).closest(".ui-dialog").find(".ui-button:first").addClass("custom");
    }
});