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on CKeditor, for images (properties box), there's textboxes to fill paths for mouse over (onmouseover="this.src='...'") and for mouse out (onmouseout="this.src='...'"), in order to replace the image on such events
but with WYSIWYG module, at least for the editor CKeditor (dunno about the others), these textboxes are not shown.
can you please enable them? thanks