code: function isConfigured( definition, tabId, elementId ) {
  		if ( elementId.indexOf( ";" ) !== -1 ) {
  			var ids = elementId.split( ";" );
  			for ( var i = 0; i < ids.length; i++ ) {
  				if ( isConfigured( definition, tabId, ids[ i ] ) )
  					return true;
  			}
  			return false;
  		}
  
  		var elementFileBrowser = definition.getContents( tabId ).get( elementId ).filebrowser;
  		return ( elementFileBrowser && elementFileBrowser.url );
  	}
docs: Returns true if filebrowser is configured in one of the elements.  @param {CKEDITOR.dialog.definitionObject} definition Dialog definition. @param String tabId The tab id where element(s) can be found. @param String elementId The element id (or ids, separated with a semicolon) to check.