code: function( className )
  		{
  			var c = this.getAttribute( 'class' );
  			if ( c )
  			{
  				var regex = new RegExp( '(?:^|\\s+)' + className + '(?=\\s|$)', 'i' );
  				if ( regex.test( c ) )
  				{
  					c = c.replace( regex, '' ).replace( /^\s+/, '' );
  
  					if ( c )
  						this.setAttribute( 'class', c );
  					else
  						this.removeAttribute( 'class' );
  				}
  			}
  		}
docs: Removes a CSS class name from the elements classes. Other classes
  remain untouched.
  @param {String} className The name of the class to remove.
  @example
  var element = new CKEDITOR.dom.element( 'div' );
  element.addClass( 'classA' );  // &lt;div class="classA"&gt;
  element.addClass( 'classB' );  // &lt;div class="classA classB"&gt;
  element.removeClass( 'classA' );  // &lt;div class="classB"&gt;
  element.removeClass( 'classB' );  // &lt;div&gt;