Inclusion of more than two JQuery libraries creates problems

I am including these JQuery libraries:

src="JQuery/jquery-1.4.2.min.js"
src="JQuery/jquery-ui-1.8.6.custom.min.js
src="JQuery/menu_login.js"
src="GjQuery/jquery-1.2.6.min.js"
src="GjQuery/jquery-ui-personalized-1.6rc2.min.js
src="GjQuery/jquery.flickr-1.0.js"
"GjQuery/jquery.flickrGallery-1.0.2.js"
<script type="text/javascript"> 
$().ready(function(){
$('#Gallery').flickrGallery({
    galleryHeight: 450
});
});
</script>

In this code, I am including 3 JQuery libraries in 开发者_开发技巧my Web application. I have two queries in my Web application before it's working fine, but when I have added the flickr library, it's doing problem. Problem is that as I include flickr library, the other two stop working. If I change the order of the inclusion then flickr library stops wroking or from other two one not doing work. Any idea?

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What is the purpose behind including multiple versions of jQuery?

If you can, use only 1 (newest hopefully) version.

Alternatively, if each plugin you are using requires a different version, use NoConflict and make sure each plugin gets the correct version that it needs. You can also use closures and self invoking functions to still use $ like normal, while controlling which version you're using.

<script src="http://code.jquery.com/jquery-1.4.2.js"></script>
<!-- other scripts that depend on 1.4.2 --->
<script>
var $.1.4.2 = $.noConflict(true);
</script>

<script src="http://code.jquery.com/jquery-1.2.6.js"></script>
<!-- other scripts that depend on 1.2.6 --->
<script>
var $.1.2.6 = $.noConflict(true);
</script>

<script>
(function($){  
  // $ in here is jQuery 1.4.2 
})($.1.4.2);

(function($){
  // $ in here is jQuery 1.2.6 
})($.1.2.6);
</script>