A quick search with the search option of the forum showed me several threads, amongst which
http://www.photoshopgurus.info/forum...pic.php?t=2237
You can also make a rectangular selection, fill that with a colour, deselect, apply the Gaussian Blur filter to it and then open the levels dialog and drag the triangular sliders together. Then reselect and fill/stroke as you fancy:
Rectangular Selection Tool on the tools palette
Alt+Del to fill with foreground colour
Filters Menu>Blur>Gaussian Blur (experiment with settings)
Image Menu>Adjustments>Levels or Ctrl/Cmd+L
See also Mark's tut on this site on Glass Buttons:
http://
photoshopgurus.info/intermediate/glass-buttons/real_glass_buttons.shtml[/url]