$.noConflict()

$.noConflict() returns undefined
Run this function to give control of the $ variable back to whichever library first implemented it.
This helps to make sure that jQuery doesn't conflict with the $ object of other libraries.
By using this function, you will only be able to access jQuery using the 'jQuery' variable. For
example, where you used to do $("div p"), you now must do jQuery("div p").
Example:

Maps the original object that was referenced by $ back to $
jQuery.noConflict();
// Do something with jQuery
jQuery("div p").hide();
// Do something with another library's $()
$("content").style.display = 'none';