Old references of $ are saved during jQuery initialization; noConflict() simply restores them.
Code sample (How to use it):
< script src="other_lib.jsfile"></ script >
< script src="jquery.jsfile"></ script >
< script >
//my jQuery custom alias(jqr) for $
var jqr = $.noConflict();
//then you can call jquery function with jqr.(whatever).
</ script >
Reference and more explanation available with following link :