$(document).ready(function () {
    $(".question").click(function () {
        $(".answer:visible").hide("fast");
        $(this).next(".answer").show("fast");
		bgimage = String($(this).parent().parent().css("background-image"));
		newbgimage = (bgimage.indexOf("Light.jpg")==-1) ? bgimage.substr(0,bgimage.length-5) + "Light.jpg)" : bgimage;
		$(this).parent().parent().css("background-image",newbgimage);
    });
});