function show_loading() { 
        IE = (document.all && navigator.userAgent.indexOf("Opera") == -1)
        
        if (IE) {
          document.getElementById("loading").style.display = "inline";
          document.getElementById("loading").offsetHeight;
          document.getElementById("loading").style.pixelTop = (document.body.clientHeight/2)-(document.getElementById("loading").offsetHeight/2)+(document.body.scrollTop);
          document.getElementById("loading").style.pixelLeft = (document.body.clientWidth/2)-(document.getElementById("loading").offsetWidth/2)+(document.body.scrollLeft); 
        }
      } 
      
      function hide_loading() {
        document.getElementById("loading").style.display = "none";
      }