$passwd="chrompack"
settitle("logonscript")
setfocus ("logonscript")
setconsole ("foreground")
run '%windir%\System32\runas.exe /user:administrator "c:\epoagent\aginst32.exe /remove "'
sleep 0.3
sendkeys ($passwd)
sendkeys (chr(13))

THIS DOES THE TRICK WITHOUT SU!
OK it isn't very neat but it works and it is just as (un)safe as using SU. I found this one somewhere hidden on this forum :-)