RadControls for ASP.NET AJAX
Please review bellow how to enable the use of Scripts when using RadEditor for MOSS:
In WebPart scenario
Set (add if not present) the AllowScripts property to true in ConfigFile.xml
In WCM scenario
This feature is available only if you have replaced the original editor through SharePoint Designer. If you are using 5.5.1 or newer version of RadEditor for MOSS, set the he AllowScripts and AllowSpecialTags properties to true in the current page using SharePoint Designer, otherwise set (add if not present) the AllowScripts property to true in ConfigFile.xml and AllowSpecialTags in the the current page using SharePoint Designer.
In SharePoint forms scenario (Lists, Wikis, Blogs, etc.)