What am I overlooking? Totally stumped!

[CathInfo]

var s = document.getElementById('field[12]');
var cust_cc_exp_month = s.options[s.selectedIndex].value;

// This displays the correct Value -- which is "0" for item #0 = "Please select..."
alert("Month: " + cust_cc_exp_month.toString());

if (cust_cc_exp_month == "0") {
// This code never executes!
}

Here is the HTML portion:
		<select id="field[12]" name="field[12]">
		<option value="0">Select a Month...</option>
		<option value="1" <?php if ($field[12] == "1") echo "SELECTED" ?>>January</option>
		<option value="2" <?php if ($field[12] == "2") echo "SELECTED" ?>>February</option>
		</select>

I've tried using cust_cc_exp_mon th.toString(), and I've tried == 0 instead of == "0".
Nothing seems to work. To me, it defies all logic! There has to be something I'm overlooking.

Thanks for any help you can provide --

Matthew

[hsriat]

Try using id as field_12 instead of field[12] or give value="x" instead of 0.

Just a guess!

[Markus]

Try using id as field_12 instead of field[12] or give value="x" instead of 0.

Just a guess!

I believe id attributes can only be numbers, letters, underscores and hypens?