From the Frame Properties dialog box, you can modify the properties of frames and change or select the URL of a file to be displayed in a frame. You can modify the sizes, borders, fonts, and other related format items of the individual frame elements within a frameset.
To modify frame properties:
Open the frameset file in the Frameset editor.
In Frames view, right-click a Frame pane and choose Properties from the pop-up menu
or
In Source view, right-click a Frame tag and choose Properties from the pop-up menu.
