Input usernames and passwords in a loop

Hi,

I am trying to enter userid and password in two different locations and i have about 50 each and may increase.  I am trying to use something like this

for userid

line.1= userid1
line.2= userid2
.
.
.
line.50 = userid50 and similarly for pwd

pwd.1=pwd1
pwd.2=pwd2 and so on

then i tried this

for i=1,50,1 do
Location(x1,y1)
type(line.i)
location(x2,y2)
type(pwd.i)


however it doesnt work. please help. Thanks in advance