How to stop AJAX from acting on jpg, pdf files etc

[kingscorp1712]

I have the following code to ajaxify my wordpress theme. However, it also tries to ajax stuff like jpg’s and pdf’s, meaning they don’t load. How do I stop this?

     // Set up variables

var base = '',

$mainContent = $("#container"),

$allLinks = $("a"),

$ajaxLoader = $("#ajaxLoader"),

$el;



// Detect link clicks

$('a:urlInternal').live('click', function(e) {

$el = $(this);

if ((!$el.hasClass("comment-reply-link")) && ($el.attr("id") != 'cancel-comment-reply-link') && ($el.attr("id") != 'contactSidebarLink')) {

var path = $(this).attr('href').replace(base, '');

$.address.value(path);

return false;

}

e.preventDefault();

});





// Actual AJAX stuff

$.address.change(function(event) {

var extension = (event.value).substr((event.value).lastIndexOf('.') +1);

if ((event.value) && ((event.value) != '/contactPopup') && extension != 'jpg') {

$("#bg").fullBg();

$ajaxLoader.fadeIn();

$mainContent.fadeOut().empty().load(base + event.value + ' #container', function() {

$ajaxLoader.fadeOut(function() {

$("#bg").fullBg(); // Resize Background

var currentPosition = 0,

slideWidth = 500,

slides = $('.slide'),

numberOfSlides = slides.length;

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