RemoveFormatTags
This option lists the names for elements that will be removed when selecting text and using the "Remove Format" button. Example:
FCKConfig.RemoveFormatTags = 'b,big,code,del,dfn,em,font,i,ins,kbd,q,samp,small,span,strike,strong,sub,sup,tt,u,var' ;
NOTE: Only inline elements are valid, so tags like "h1" or "pre" can't be used there.