R help - Nov 2013 - Holt Winters for multiple customers and output with R

So I've been working through the HW work here
http://a-little-book-of-r-for-time-series.readthedocs.org/en/latest/src/timeseries.html
and have started testing with some "live" customer data. I have a
dataset that looks like:

CustomerID |   Sales

123456         $5,000

123456         $3,455

123456         $7,540

123456         $2,300

987654         $5,600

987654         $6,700

987654         $1,300

987654         $690

Where I have "Sales" values by customer for the previous 60 months.
There are ~200 customers for which I'm looking to generate a forecast.
I'm able to generate a forecast for a single customer at a time but am
having trouble finding guidance on how to run the forecast for the whole group
of customers and output the results.

Ideally, the output would be the regular forecast output but with Customer ID
included, like so:

CustomerID | Month | Point.Forecast | Lo.80 |Hi.80 | Lo.95 | Hi.95

Thanks in advance for the help and please let me know if there's any other
info I can include to help.

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