From http://api.jquery.com/jQuery.noConflict/

jquery_conflict.js

$.noConflict();
jQuery( document ).ready(function( $ ) {  
  // Code that uses jQuery's $ can follow here.
  });
  // Code that uses other library's $ can follow here.

noConflict2.js

jQuery.noConflict();
(function( $ ) {
  $(function() {
    // More code using $ as alias to jQuery
  });
})(jQuery);
 
// Other code using $ as an alias to the other library  

noConflict3.js

var j = jQuery.noConflict();
 
// Do something with jQuery
j( "div p" ).hide();
 
// Do something with another library's $()
$( "content" ).style.display = "none";