JQuery - are these the same but different version?

I have so many jquery plugins for a page that I'm thinking maybe some of them are the same?

Do any of these cover one over the other, therefore I do not need to include them:

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.js"></script>
<link rel="stylesheet" type="text/css" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.1/themes/base/jquery-ui.css"/>
<script src="http://code.jquery.com/jquery-latest.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.5.0/jquery.min.js"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.9/jquery-ui.min.js"></script>

Is it better to link the jqueries or should I try any download them and place them in the server?

I have been testing so many jquery plugins that I can't remember what needs what. Is there any way of knowing whats needed in a page?

Is it bad and could cause issues if you have the same jquery plugin called several times on a page?

You use both jqueryui/1.7.2 and jqueryui/1.8.9, I think you shouldn't mix them firstly. Secondly, I think that google access for including are not bad if your site is public because a lot of have it inside their cache.

use any higher version of jquery and ignore all other lower even if mentioned by addon you are using.

Ex. if you already used


then you need not to include



this will work