[closed] Has anyone else seen this error in javascript and only on IE7 browser?

While testing on IE7 I noticed some form submits causing javascript errors(message was something like, "Object doesn't support this property"). The reason the error was caused in IE(not Firefox) was because of the way "beforeunload" events are being added on certain pages. The pages are:

• ./forum/skins/default/templates/ask.html
• ./forum/skins/default/templates/answer_edit.html
• ./forum/skins/default/templates/question_edit.html
• ./forum/skins/default/templates/question.html

The "addEventListener" and "removeEventListener" methods are used but IE7 doesn't work well for these methods.

To solve, I just modified the javascript code to do this:

if (window.detachEvent) {
    window.detachEvent('beforeunload', beforeUnload);
} else if (window.removeEventListener) {
    window.removeEventListener('beforeunload', beforeUnload, true);
} else {
    document.removeEventListener('beforeunload', beforeUnload, true);
}

if (window.attachEvent) {
    window.attachEvent('beforeunload', beforeUnload, true);
} else if (window.addEventListener) {
    window.addEventListener('beforeunload', beforeUnload, true);
} else {
    document.addEventListener('beforeunload', beforeUnload, true);
}

I just wanted to find out if anyone noticed this issue and fixed in a similar way. Here is my SVN info:

• URL: http://svn.osqa.net/svnroot/osqa/trunk
• Repository Root: http://svn.osqa.net/svnroot
• Repository UUID: 0cfe37f9-358a-4d5e-be75-b63607b5c754
• Revision: 567
• Node Kind: directory
• Schedule: normal
• Last Changed Author: matt
• Last Changed Rev: 567
• Last Changed Date: 2010-08-23 08:13:15 -0500 (Mon, 23 Aug 2010)