是否可以在同一页面上使用jQuery的2个版本?

注意:我知道已经问过类似的问题了在这里，但是我正在寻找其他说明，以了解如何使它起作用，或者是完全避免使用它的充分理由.

NOTE: I know similar questions have already been asked here and here, but I'm looking for additional clarification as to how to make this work or good reasons for avoiding it entirely.

我正在向已经使用旧版本jQuery库(1.1.3.1)的现有网站添加功能.我一直在针对最新版本的jQuery库(1.4.2)编写添加的功能.我仅使用较新版本的jQuery测试了该网站，但它破坏了功能，因此现在我打算在同一页面上使用这两个版本.这怎么可能?

I'm adding functionality to an existing web site that is already using an older version of the jQuery library (1.1.3.1). I've been writing my added functionality against the newest version of the jQuery library (1.4.2). I've tested the website using only the newer version of jQuery and it breaks functionality, so now I'm looking at using both versions on the same page. How is this possible?

我需要在代码中做什么以指定我使用的是一个版本的jQuery，而不是另一个版本的?例如，我将两个版本的jQuery的<script>标记放在页面的标题中，但是我需要做些什么，以便使我在调用代码中确定知道正在调用该库的一个版本还是另一个?

What do I need to do in my code to specify that I'm using one version of jQuery instead of another? For example, I'll put <script> tags for both versions of jQuery in the header of my page, but what do I need to do so that I know for sure in my calling code that I'm calling one version of the library or another?

也许是这样的:

//Put some code here to specify a variable that will be using the newer
//version of jquery:
var $NEW = jQuery.theNewestVersion();

//Now when I use $NEW, I'll know it's the newest version and won't
//conflict with the older version.
$NEW('#personName').text('Ben');

//And when I use the original $ in code, or simply 'jquery', I'll know
//it's the older version.
$('#personName').doSomethingWithTheOlderVersion();

更新:阅读了一些答案之后，我开始怀疑尝试玩这个游戏是否甚至是个好主意...