I know that $ sign only used for us to remind that this variable contains Jquery object or so.

But for the sake of  learning I tried not use $ sign in my variable name but it doesn't work without a $ sign..

I want to know what changes would I have to make in my code to make it work without the $ sign. 

This is working code:

var $overlay = $('<div id="overlay"></div>');

var $image = $("<img>");

//Add image in overlay

$overlay.append($image);

//Add overlay

$("body").append($overlay); 

//Capture the click event on a link to an image

$("#ImageGallery a").click(function(event)

{

event.preventDefault();

var imageLocation = $(this).attr("href");

$image.attr("src", imageLocation);

$overlay.show();

});

This one without the $sign: