You could also do:

$iif($me ison #,Notice #):notice # $$?"enter msg "

This way the popup will only show up if you're in a channel (altho if you put it in the popups section of mirc you wouldnt need to do that except maybe under the following circumstance):

$iif($me ison #andr,Notice #):notice # $$?"enter msg "


Those who fail history are doomed to repeat it