To see all of the frameset properties, click the expander arrow in the lower right corner of the Property inspector.
Borders Controls the border of frames within the current frameset.
Choose Yes to display borders in 3D and gray, choose No to display borders as flat and gray, or choose Default to let the browser determine how borders are displayed. Most browsers default to Yes. Border Color Sets a border color for all borders in the current frameset. This setting can be overridden by a border color specified for single frame. Value Specifies the size of the selected row or column.