The panel to the left features a column of TextButtons (separated by <BR> tags) that blend into the page background. This is achieved by setting the ButtonColor to match the page's body background and setting Button3D to 'no'.

The gap between each button is altered by adjusting the applet height. You might wish to minimize the applet height to almost exactly match that of the chosen font, and then add VSPACE to each applet tag.

Of course, you can still create multi-line buttons that have a similar 'button-less' effect if you wish to, using AutoWrap or delimited text in the usual way. You might also choose to apply the 3D effect to the text.