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I've got a snippet for that, but not on this PC; PM me or reply on this topic to remind me to look for it
// checking FCKeditors on the page
// will return the first FCKeditor instance in which changes were detected or false of no changes were made
var fckeditorName, editorInstance;
for (fckeditorName in FCKeditorAPI.Instances) // Use __Instances in FCKeditors prior to version 2.6
if ((editorInstance = FCKeditorAPI.GetInstance(fckeditorName)).IsDirty())