Poison- Target sight

[opa]

Hello, i am brazillian player and i was making this script to cast automatically poison as soon the other player get in my target sight. But there is one problem... the script keeps running even if the target get poisoned or if i am disturbed . I wondering if you guys can help me to make the script cast poison and if the player get poisoned the script stop runnning... Sorry for my english

sub poison()
repeat
uo.cast('Poison','laststatus')
CastWait()
wait(600)
until not uo.injournal('Target fora da linha de visao')
repeat
wait(100)
end sub

Sub CastWait()
var LastMana=UO.Mana
UO.DeleteJournal()
REPEAT
If LastMana > UO.Mana or UO.InJournal("Target fora da linha de visao") Then
return
Else
If LastMana < UO.Mana Then
LastMana = UO.Mana
End If
End If
Wait(250)
Until UO.Dead()
end sub