<embed type="application/x-spt" width=12 height=12
button=push target="chime_graphics"
script="
 reset #resets orientation and zoom
 restrict not protein #selects protein and hides anything
   # which is not protein.
 center selected #makes rotations center around
   # the selected atoms. Also 'zooms' keep this center centered. 
 zoom 200
 rotate y -55
">Heme Only

"Heme Only" is plain text which will appear following the button.

How do I know what script commands will show what I want?