function openPopup(popupVars) {
      document.all.popupScreenBack.style.visibility="visible";
      document.all.popupScreenFront.style.visibility="visible";
      document.body.style.overflow="hidden";

      document.getElementById("popupContent").src = "./script/popup/popup_view.php?v="+popupVars;
    }
    function sluitPopup() {
      document.all.popupScreenBack.style.visibility="hidden";
      document.all.popupScreenFront.style.visibility="hidden";
      document.body.style.overflow="";
    }