Weird concatenation

[lyxus]

Hello,

I have some constant namde like this

ok1
ok2
ok3
ok4 etc....

I am doing a loop
but i don't know how i can acces to those value

for i in 0 to 1loop

if (d_col_1(i)='1') then
go("ok"+i,red);

END IF;

But it wont't work do you have any clue ?

Thanks