Question

Hi all
i put jquery file in master page version jquery-1.4.2.min.js and in another page
jquery file jquery-1.2.6.min.js just in Firefox the jquery features don’t work

Answer 1

JavaScript doesn’t support class, function or whatever library.

You’re just including jQuery twice – different versions -.

If you want to use both, you’d need to change jQuery prefix.

Version A: $
Version B : $$

Or any other valid prefix.

You can do so by changing jQuery object name to jQueryA and jQueryB, and at the end of jQuery source code, change the “$”:

// Expose jQuery to the global object
window.jQueryA = window.$ = jQueryA;

…and:

// Expose jQuery to the global object
window.jQueryB = window.$$ = jQueryB;

It’s not a good approach so far, but maybe your requirements are leaving an old version of jQuery for some tasks because you don’t support some code, and you want to do some new feature with another and newer jQuery version…