There are 4 of these all the same. I narrowed it down to this line by a process of elimination:

originalImg = $(element).find('.ProductImage a img').attr();

I'm at a bit of a loss of what might be causing this.

Here is my code in full:

$(function(){

    $('.SubCategoryList li').each(function(index, element) {

        $(element).append('<div class=ProductListWrapper></div>')

        var subcategory_link = $(element).find('a').attr('href');

        $(element)

            .find('.ProductListWrapper')

            .load( subcategory_link + ' #CategoryContent ul.ProductList', productHovers);

    });

});



function productHovers(){

    $('.SubCategoryList .ProductList li').each(function(index, element){



        // This is the problem line. 

        originalImg = $(element).find('.ProductImage a img').attr(); 



        $(element).mouseover(function(){

           var link = $(this).find(.ProductImage a).attr('href');

           $.get(link,function(data,status){

               var tinyImg = $(data)

                   .find('.ImageCarouselBox ul li:nth-child(1) img')

                   .attr('src');

               var imageSRC = tinyImg.replace('.60.60.jpg','.200.200.jpg');

               $(element).find('.ProductImage a img').attr('src',imageSRC);

           });

        });

        $(element).mouseleave(function(){

             $(element).find('.ProductImage a img').attr('src',originalImg);

        });

    });

}