I have this link:
<a href="reply.cfm" target="_blank"
onClick="window.open('reply.cfm?
sentfrom=#sentfrom#
','mywindow','width=500,height=500,
resizable=no,
scrollbars=no,toolbar=no
,location=no,directories=no,status=no,
menubar=no')">Reply</a>
I've split the links into bits as the text box...