code: function modifyOption( combo, index, title, value )
  	{
  		combo = getSelect( combo );
  		if ( index < 0 )
  			return false;
  		var child = combo.getChild( index );
  		child.setText( title );
  		child.setValue( value );
  		return child;
  	}
docs: Modify option  from a SELECT object.