function ShowPopup()
   {
        document.getElementById('X_POPUP').style.visibility="visible";
        document.getElementById('X_BG').style.visibility="visible";
        return 0;
   }

  function HidePopup()
   {
        document.getElementById('X_POPUP').style.visibility="hidden";
        document.getElementById('X_BG').style.visibility="hidden";
        return 0;
   }

  function Invert(iBtn)
   {
        UnInvert();
        switch (iBtn)
         {
              case 1:
               {
                    document.getElementById('BTN_1').style.visibility="visible";
                    break;
               }
              case 2:
               {
                    document.getElementById('BTN_2').style.visibility="visible";
                    break;
               }
              case 3:
               {
                    document.getElementById('BTN_3').style.visibility="visible";
                    break;
               }
              case 4:
               {
                    document.getElementById('BTN_4').style.visibility="visible";
                    break;
               }
              case 5:
               {
                    document.getElementById('BTN_5').style.visibility="visible";
                    break;
               }
              case 6:
               {
                    document.getElementById('BTN_6').style.visibility="visible";
                    break;
               }
              case 7:
               {
                    document.getElementById('BTN_7').style.visibility="visible";
                    break;
               }
         }
        return 0;
   }

  function UnInvert()
   {
        document.getElementById('BTN_1').style.visibility="hidden";
        document.getElementById('BTN_2').style.visibility="hidden";
        document.getElementById('BTN_3').style.visibility="hidden";
        document.getElementById('BTN_4').style.visibility="hidden";
        document.getElementById('BTN_5').style.visibility="hidden";
        document.getElementById('BTN_6').style.visibility="hidden";
        document.getElementById('BTN_7').style.visibility="hidden";
        return 0;
   }