How to remove the site theme from the FCKeditor text box...

Hi,

The FCKeditor iFrame contains its own html & body tags, which is why it looks like one of your site's pages. One way around this is to be very specific with all your CSS selectors in the theme style.css file.

Another, I think simpler, way is to tweak the FCKeditor settings:

Head over to the FCKeditor config settings at /admin/settings/fckeditor and edit the profile you're using. Under the 'CSS' heading, change the 'Editor CSS' field to something other than 'theme CSS', which is causing FCKeditor to use your theme's style.css file.

For example, I set it to 'Define CSS' and then set the next field to: %h%tfck_editorarea.css
... so FCKeditor is using the CSS file at: sites/example.com/themes/mytheme/fck_editorarea.css

Then put any styling you want in that file. Bear in mind that those styles will only apply when editing the node; when the node is viewed, it will use the style.css, so if you want the same styles in both you'll need to copy them to both files. I know that seems a bit clumsy, but it means you can use different styling while editing.

This is for the D5 version of the FCKeditor module, but I think the settings are similar in the D6 version.