Yoko

sub loot() 
UO.FindType("0x0F88","-1","container")  #NightShade
UO.Grab("0","finditem") 
UO.FindType("0x0F85","-1","container")  #Gingseng
UO.Grab("0","finditem") 
UO.FindType("0x0F7B","-1","container")  #BloodMoss
UO.Grab("0","finditem") 
UO.FindType("0x0F8C","-1","container")  #Sulfour's Ash
UO.Grab("0","finditem") 
UO.FindType("0x0F86","-1","container")  #Mandrake Roots
UO.Grab("0","finditem") 
UO.FindType("0x0F84","-1","container")  #Garlic
UO.Grab("0","finditem") 
UO.FindType("0x0F8D","-1","container")  #Spider's Silk
UO.Grab("0","finditem") 
UO.FindType("0x0F7A","-1","container")  #Black Pearl's
UO.Grab("0","finditem") 
end sub 

I'm trying to make a script which would loot 50 of each reg from bank when i open bank and say ,exec loot but it gives me errro "invalid object:0"

maybe you not defined "container" object
And check, what uo.getserial("finditem") is not equal to zero
(i.e. uo.findcount() not equal to zero)

_________________
Без труда не выловишь и рыбку из пруда,
А без пруда не выловишь её и с трудом...

How to define Bank object?

A know only one way:
get serial of ANY object in bank and then make little temporary script:
sub temp()
uo.addobject("bank",uo.containerof("here serial of any item in bank"))
end sub

_________________
Без труда не выловишь и рыбку из пруда,

А без пруда не выловишь её и с трудом...

Also - there is uo.objatlayer("Bank")

_________________
Без труда не выловишь и рыбку из пруда,

А без пруда не выловишь её и с трудом...

or just to complete this list you could also go to bank, say "bank" then
,info lastcontainer
would give you serial of bank...