You can't do it through jQuery alone; you'll need a combination of Ajax (which you can do with jQuery) and a PHP back-end. A very simple version might look like this:
HTML:
<img class="foo" src="img.jpg" />
<img class="foo" src="img2.jpg" />
<img class="foo" src="img3.jpg" />
Javascript:
$("img.foo").onclick(function()
{
// Get the src of the image
var src = $(this).attr("src");
// Send Ajax request to backend.php, with src set as "img" in the POST data
$.post("/backend.php", {"img": src});
});
PHP (backend.php):
<?php
// do any authentication first, then add POST variable to session
$_SESSION['imgsrc'] = $_POST['img'];
?>
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