<script language="javascript" src="jquery.ui/jquery-1.2.4a.js" ></script>
<script language="javascript" src="jquery.ui/ui.base.min.js"></script>
<script language="javascript" src="jquery.ui/ui.draggable.min.js" ></script>//注：引用的三个插件顺序不能变
<script language="javascript">
$(function() {
//直接调用拖拽方法
$("div").draggable();
});
</script>
</head>
<body>
<form >I am three</div>
</div>
</form>
</body>