code: function ()
          {
              // Create the background if neccessary
              ModalDialog.background = document.createElement('DIV');
              ModalDialog.background.className      = 'ModalDialog_background';
              ModalDialog.background.style.position = 'fixed';
              ModalDialog.background.style.top      = 0;
              ModalDialog.background.style.left     = 0;
              ModalDialog.background.style.width    = (screen.width + 100) + 'px';
              ModalDialog.background.style.height   = (screen.height + 100) + 'px';
              ModalDialog.background.style.backgroundColor = 'rgb(204,204,204)';        
              ModalDialog.background.style.opacity = 0;
              ModalDialog.background.style.zIndex = 3276;
              ModalDialog.background.style.filter = "Alpha(opacity=50)";
                  
              document.body.appendChild(ModalDialog.background);
      
              ModalDialog.background.style.visibility = 'visible';
          }
docs: Shows the background semi-transparent darkened DIV