Full FlashMX 2004 rule set: The following will validate that the page complies fully with the flashMX 2004 specification. valid_elements : “” +”a[href|target],” +”b,” +”br,” +”font[color|face|size],” +”img[src|id|width|height|align|hspace|vspace],” +”i,” +”li,” +”p[align|class],” +”h1,” +”h2,” +”h3,” +”h4,” +”h5,” +”h6,” +”span[class],” +”textformat[blockindent|indent|leading|leftmargin|rightmargin|tabstops],” +”u” add custom buttons http://wiki.moxiecode.com/index.php/TinyMCE:Configuration/theme_advanced_buttons_1_n