Java Script Error while editing the content editor

This error is due to the JavaScript plug-ins (HtmlEditor.js or BFORM.js) files in the 1033 folder on the 12 hive. When you add the SP1, it did not update these two files to compliance with .js codes in 'content editor' web parts. These kind of issues occur when you miss the installation sequence, i.e. SP1 was added after the java script plug-ins. Thus, unable to control the files later.

Steps to recover:
If you have more than one severs running in the form, go to the server in the form, where the Content editor popups are working fine.
Go to: C:\Program Files\Common Files\Microsoft Shared\web server extensions\12\TEMPLATE\LAYOUTS\1033
Replace the HtmlEditor.js , BFORM.js and OWS.js with the healthy server's files.While trying to edit(edit->modify shared webpart-> rich text editor) a Content Editor Webpart, Rich text editor window will popup.Due to the popup blocker flags on the browsers, this popup window will be blocked. To avoid this, Microsoft added the fix within the servive packs that will go and edit the javascript plug-ins on the MOSS 2007 . This update goes with the installation of the WSS SP1.