Multiple Checkbox

I have a function that I call to check or uncheck all checkboxes on a
form - I use a 'master' checkbox to do this much like hotmail has to
check all mail messages - the code works fine if I name my checkboxes
like this:
chk1
chk1
chk1

But I need to name them with an array for deletion purposes which is
already coded and working - I need to name them like this:
chk[0]
chk[1]
chk[2]

I can't get the check/uncheck function to work with array checkbox
names - at the bottom of this I show my main checkbox I use to check
or uncheck all the others checkboxes named chk1 - but how do I pass
the name of the array checkboxes Code: