dbi provides useful quoting methods, which are designed to prepare your data for use in an sql statement, but could just as easily make it pretty enough for javascript. consider:

map {$dbh->quote($_) } ($custno, $companyName, $address, $city, $state
+, $zip);
[download]

or, for double quotes around most values, try $dbh->quote_identifier($_) in the map instead.

hth,
--au