Example of a 'variable option' that depends on a quantity box,
useful for ordering different numbers of different sizes.  We
suppress the normal qty box, and create our own that are associated
with specific options, in this case product sizes.

The all have the same option number, but the are associated with
'different' products, the thing in quotes (sm,md or lg) is tacked
on to product id number in the browser text (putting the contents of 
the global variable $sc_web_pid_sep_char in between.)

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