Try using this as a code now you can repeat the code to
add as many channels as you want to use in your Auto-Join

Code:
  
if ($did == 2) { 
  if (%jchan1 == $null) { set %jchan1 $?="Enter the #Channel you wish to join:") }
  if (%jchan1 != $null) { /join %jchan1 }
  else { halt }
}


I found it alot easer to add the channels I want into Mirc Options\Connect\perform that way I could specify the network I wanted the ajuto join to join the channels in.
other wise you might join another network and still join the same channels