jQuery UI-Draggable不是函数吗?

我试图在页面上的某些div上使用可拖动效果，但是每当我加载页面时，都会收到错误消息:

I've trying to use the draggable effect on some divs on a page, but whenever I load the page, I get the error message:

Error: $(".draggable").draggable is not a function

我环顾四周，似乎其他人遇到了这个问题，因为他们没有包括jQuery UI javascript文件，但是我绝对有.

I've had a look around it seemed other people were having this problem as they had not included the jQuery UI javascript file, but I definitely have.

以下是我页面的标题标签内:

The following is within the head tag of my page:

<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.1/jquery.min.js" type="text/javascript"></script>    
<script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.1/jquery-ui.min.js"></script>

有人可以提出解决方案吗?

Can anyone suggest a solution?

任何建议表示赞赏.

谢谢.

快速编辑，我也将jquery工具js包含在页面的顶部，如果我删除了它，就可以了.有没有人设法使这两个一起工作?

Quick edit, I also have the jquery tools js included in the head of the page, if I remove this it works OK. Has anyone managed to get these two working together?