You could check for the jQuery object - this will get round jQuery...

if(jQuery) {

There must be prototype only objects/functions/classes you can test for in 

I am not sure about other libraries but i think extjs uses the "Ext." 
namespace and similar with yahoo
----- Original Message ----- 
From: "Diodeus" <>
To: "Prototype &" <>
Sent: Thursday, July 09, 2009 8:10 PM
Subject: [Proto-Scripty] Alternatives to Protosafe?

> I am working on a content delivery solution. This would allow people
> to include some content on their page by adding a script tag. I would
> like to add some slickness to the content, so I would like to use
> Prototype.
> I'm looking for some suggestions to safely add Prototype to the target
> pages (I'm inserting a script tag dynamically) without interfering
> with an existing copy of Prototype, jQuery or other libraries.
> >

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