background is not going to the foreground with jquery

Question

Hello,

my question is if it would be possible to get the background images to the foreground

I created a mask from an example with the div's z order to 9000 and the div containing the form to 9999

Sofar that works

But if I use a class with a background image, it will not show

Y tested everything on a testpage without the mask and it works. Then I moved the stuff to the page with the mask, and then the background images don't show anymore

normal images don't seem to have that problem

this is my testpage

// het tbnote opties menu
    $("#tbnoteopties").click(function() {
      $(this).toggleClass("uit").toggleClass("aan");
      $(this).next().toggleClass("expanded").toggleClass("collapsed").slideToggle("normal");
    });

thanks, Richard