<A href="javascript:retract()"><IMG class="topimg" src="icons/retract.png"
id="retract" alt="Retract"
title="Undo execution of one step of the script."></A>
+ <A href="javascript:gotoTop()"><IMG class="topimg" src="icons/top.png"
+ id="top" alt="Top" title="Undo execution of the whole script."></A>
<A href="javascript:gotoPos()"><IMG class="topimg" src="icons/position.png"
id="cursor" alt="Play"
title="Execute the script until the current position of the cursor."></A>