I am getting a lot of these errors. (Windows XP Professional, Firefox Browser):

message - this.parent has no properties
fileName - http://localhost:7633/zimbra/js/Zimb...v=070130033225
lineNumber - 3552
stack - ([object Object])@http://localhost:7633/zimbra/js/ZimbraCore_all.js.zgz?v=070130033225:3552
([object Object])@http://localhost:7633/zimbra/js/ZimbraCore_all.js.zgz?v=070130033225:14510
([object Object])@http://localhost:7633/zimbra/js/ZimbraCore_all.js.zgz?v=070130033225:14437
([object Object])@http://localhost:7633/zimbra/js/ZimbraCore_all.js.zgz?v=070130033225:14392
([object Object],[object Object])@http://localhost:7633/zimbra/js/ZimbraCore_all.js.zgz?v=070130033225:14344
apply([object Object],[object Array])@:0
([object Object])@http://localhost:7633/zimbra/js/Boot_all.js.zgz?v=070130033225:541
([object Object],[object Object])@http://localhost:7633/zimbra/js/ZimbraLogin_all.js.zgz?v=070130033225:386
apply([object Object],[object Array])@:0
([object Object])@http://localhost:7633/zimbra/js/Boot_all.js.zgz?v=070130033225:541
([object Object],[object Object])@http://localhost:7633/zimbra/js/AjaxLogin_all.js.zgz?v=070130033225:3746
()@http://localhost:7633/zimbra/js/AjaxLogin_all.js.zgz?v=070130033225:3701
@:0

name - TypeError