I don't use rep and I don't know what template to play with but here is a code to open a new window. I would mess around on a test site first. Where you see newwindowhere is where you want to put the url and there is different ways of putting the url in.
HTML Code:
<a href="<a href="http://www.newwindowpagehere" onClick="window.open('http://www.newwindowpagehere', 'window_name', 'toolbar=yes,location=yes,directories=yes,menuBar=yes,scrollbars=yes,resizable=yes,width=970,height=550,left=10,top=10'); return false"> Text here </a>