如何使用jquery更改div标题

<div id="DivPassword" title="test" >

我想改变div标题,我有以下代码：

function ChangeAttribute() {
         $("#DivPassword")
            .attr('title','Photo by Kelly Clark');
         $('#DivPassword').dialog('open');
         return false;
     }

当对话框打开时,标题仍然是测试！如果我没有为div分配任何标题,该对话框不会显示任何标题.我该怎么纠正？

function ChangeAttribute() {
         $("#DivPassword")
            .attr('title','Photo by Kelly Clark')
            .dialog('open');

         alert($("#DivPassword").attr('title'));
     }

$('#DivPassword').dialog({
             autoOpen: false,width: 800,buttons: {
                 "Cancel": function() {
                     $(this).dialog("close");
                 },"Accept": function() {
                 alert($(this).attr('title'));
                     $(this).dialog("close");
                 }
             }
         });

<script type="text/javascript">
     var Dtitle;
     $(function() {
        $('#DivPassword').dialog({

             autoOpen: false,title : Dtitle,"Accept": function() {
                     $(this).dialog("close");
                 }
             }
         });
     });

     function ChangeAttribute(name) {
         $("#DivPassword")
            .attr('title',name)
            .dialog('open');
         Dtitle = $("#DivPassword").attr('title');
         alert(Dtitle);
     }


</script>