I have found a way to basically determine if the form submit came from the FCKEditor or not.

Code:
function doSave(e) {
            
    //e is null when its the FCKEditor save button
    if (e == null) {

		//Do your submit on FCKEditor save button work

		return false; //this disables default action (submitting the form)
	}
			
//if e isn't null its a valid asp.net form
...