Code:
 on *:text:!uss*:#:{
if ($nick isop $chan) && ($2-) { /uss $chan $2- }
}
alias uss {
if ($1 ischan) {
msg $1 http://www.mysite.net/users.php?search= $+ $replace($2-,$chr(32),+) 
}
else {
echo http://www.mysite.net/users.php?search= $+ $replace($1-,$chr(32),+)
}
}