$.showSlide = function()
{
    $.hideSlide();
    $('#main').animate({opacity: 0.8}, 5, function() {
        $(this)
            .css({'background-image': 'url(fileadmin/user_upload/achtergrondFotos/Home/'+$currentSlide+'.jpg)'})
            .animate({opacity: 1});
    });
    $('#textElement'+$currentSlide).show($speedShowing);
};