Press alt+R to open the scripts, and go to the aliases tab.
Starting with a new line type:
}
/porygon {
If (%porygon == 1) {
timerc off
color background 0
set %porygon 0
return }
timerc 0 0 /porygonbodge
set %porygon 1
}
/porygonbodge {
color background 2
color background 4 }
}

Make sure you get all the spaces correct. If your mIRC window is black instead of white, set the first color background near the top to 1 instead of 0

A little something I worked on from a script Cryomance gave me for raving. Type /porygon and seizure away!