Is there anyway to remove a spawned template once it has been created?

The current page setup has a button with a 'Mouse Up' action which runs a javascript code:

var a = this.getTemplate("HS");

a.spawn();

The script works fine, however, every time the button is pressed a duplicate template is created and so on. I'd like to find a way so that if the button is pressed more than once, either the previous template is removed or is replaced each time the button is pressed.

Thank you,

Mdog