Edit in JSFiddle

<div id="dialog" title="jQuery Dialog"><span>Delete all Items !!</span></div>

$(function () {
        $("#dialog").dialog({
            resizable: false,
            height: 160,
            modal: true,
            buttons: {
                "Delete items": function () {
                    $(this).dialog("close");
                },
                Cancel: function () {
                    $(this).dialog("close");
                }
            }
        });
    });