I have a web page, written in PHP, where various form elements have
names like NAME="date[month]" or NAME="date[year]", such that these
get put into the array $date.

On the page in question, I need to refer to those fields using
javascript. If the name was something like NAME="month", I could refer
to document.form.month.value, ... but it is apparently not possible to
refer to document.form.date[month].value.

Is there a way to refer to a form element that has brackets in its
name?