Passing a variable to a function

The only way I can see you doing this is to define constants which act as indexes for the fields within the type .. sort of like this ..

const I_x = 1
const I_y = 2
const I_z = 3
const I_Strength = 4

Search( I_Strength , 100 )

function search.stuff( field , value )

for s.stuff = each stuff
select field
case I_x
If s\x = value return s
case I_Strength
If s\Strength = value return s
etc.....
end select
next

return null

end function