Question

is it possible to load and use jquery in the parent iframe page & inside the iframe whithout loading jquery twice,
meaning to load jquery just once in the page and using it in the ifrmae within.

Answer 1

Sure, just make sure the <iframe> isn’t loading the jQuery script i.e. <script src="...."> then you can access the jQuery instance in the parent like so:

var $ = window.top.$; 

Be sure to use the correct context using the second parameter:

$('img', document);

If this isn’t possible you can’t “prevent” a script from being downloaded and executed.