I need a Wordpress developer to fix a javascript error

General information for the website: Fishing and outdoor equipment online store
Description of requirements/features: I need a Wordpress developer to fix a javascript error appearing on Woocommerce single products page, due to this error the page template is not loading the footer, related products etc.

Mozilla Firebug is reporting the following error:

TypeError: $(...).iosSlider is not a function...

This is the function which is throwing this error





(function($){
$(window).load(function(){

$('.doubleSlider-1').iosSlider({
scrollbar: true,
snapToChildren: true,
desktopClickDrag: true,
infiniteSlider: false,
navPrevSelector: $('.product_single_slider_previous'),
navNextSelector: $('.product_single_slider_next'),
scrollbarHeight: '2',
scrollbarBorderRadius: '0',
scrollbarOpacity: '0.5',
onSliderLoaded: doubleSlider2Load,
onSlideChange: doubleSlider2Load,
onSliderResize: doubleSlider2Load
});

Please see the following single product url for more information.

http://www.afn.com.au/product/12-issue-subscription-sport-fishing/
Extra notes: