var lastFocusedControlId = "";

      function focusHandler(e) {
          document.activeElement = e.originalTarget;
      }

      function appInit() {
          if (typeof (window.addEventListener) !== "undefined") {
              window.addEventListener("focus", focusHandler, true);
          }
          Sys.WebForms.PageRequestManager.getInstance().add_pageLoading(pageLoadingHandler);
          Sys.WebForms.PageRequestManager.getInstance().add_pageLoaded(pageLoadedHandler);
      }

      function pageLoadingHandler(sender, args) {
          lastFocusedControlId = typeof (document.activeElement) === "undefined"
        ? "" : document.activeElement.id;
      }

      function focusControl(targetControl) {
          try {
              if (Sys.Browser.agent === Sys.Browser.InternetExplorer) {
                  var focusTarget = targetControl;
                  if (focusTarget && (typeof (focusTarget.contentEditable) !== "undefined")) {
                      oldContentEditableSetting = focusTarget.contentEditable;
                      focusTarget.contentEditable = false;
                  }
                  else {
                      focusTarget = null;
                  }
                  targetControl.focus();
                  if (typeof (targetControl.select) !== "undefined")
                      targetControl.select();
                  if (focusTarget) {
                      focusTarget.contentEditable = oldContentEditableSetting;
                  }
              }
              else {
                  targetControl.focus();
                  if (typeof (targetControl.select) !== "undefined")
                      targetControl.select();
              }
          } catch (Error) { }
      }

      function pageLoadedHandler(sender, args) {
          if (typeof (lastFocusedControlId) !== "undefined" && lastFocusedControlId != "") {
              var newFocused = $get(lastFocusedControlId);
              if (newFocused) {
                  focusControl(newFocused);
              }
          }
      }

      Sys.Application.add_init(appInit);