// copied from http://www.ironspeed.com/articles/Restore%20Focus%20Postbacks/Article.aspx
// fixes bug with loss of focus after a postback
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) {
    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;
}
try {
          targetControl.focus();
          } catch (err) {}
      if (focusTarget) {
        focusTarget.contentEditable = oldContentEditableSetting;
      }
    }
    else {
        targetControl.focus();
    }
}
 
function pageLoadedHandler(sender, args) {
    if (typeof (lastFocusedControlId) !== "undefined" && lastFocusedControlId != "") {
      var newFocused = $get(lastFocusedControlId);
        if (newFocused) {
        focusControl(newFocused);
        }
    }
}