(aliases)
blah {
echo -a BLAH! $$1-
}

when called
/blah asd qwe zxc
it'll echo "BLAH! asd qwe zxc"

but when you type
/blah
nothing will happen, since $1 isnt specified.

is it possible to add a custom message, similar to the default mIRC error messages?
eg.

* Too few parameters: $blah

or

* * /blah: invalid parameters

http://www.thatawesomeshirt.com and http://twigstechtips.blogspot.com =)