$(document).ready(function(){
    $(".tx-qsdownloadsv2-pi1 li li ul").hide();
    
    $(".tx-qsdownloadsv2-pi1 li li span").click(function(){
                
        var open = $(this).hasClass("open");
                
        if (open) {
            $(this).css("backgroundImage", "url(fileadmin/templates/gfx2/plus2.gif)")
                   .removeClass("open")
                   .siblings("ul")
                   .slideUp("fast");                   
        } else {
            $(this).css("backgroundImage", "url(fileadmin/templates/gfx2/minus2.gif)")
                   .addClass("open")
                   .siblings("ul")
                   .slideDown("fast");
        }
    });
})