not a bad little snippet, but you might want to get rid of the if (

) event as it serves no purpose judging by the looks of your code. you also might want to try shortening the number of global variables as much as possible, use the sockmark command and $gettok!

1) error checking meaning that you should check for possible errors that may occur. example: if ($did(5).text) { script } else { etc }
2) yeah, i just saw a few here and there that could be simplified, this isn\'t vital.
3) $ialchan(address,#channel,N) consult /help $ialchan. basically, you can use an if comparison to check if there are multiple nicks using something similar to: if ($ialchan(address,#,0) > 1) this will check if there are more than one users matching the address in the ial for #channel. like i said, /help $ialchan ;P

you should provide much more error-checking than you have supplied. also, did -r and did -a can be simplified to did -ra. you can use multiple switches in one go :P i\'d also try using $ialchan, it\'d save you from looping through the nicklist.

very very nice! jaytea is right, you definitely are a future animator! i think you should use something similar to unset %swirl.* in the on close event.