I'm wanting to do a form validation before it is submitted, and I am having a problem inside my JS checkform() function getting a hold of the "product[]" values, which in the form are in array notation.

For some reason, I am getting JS errors such as "product has no properties" etc. when I try to use "product" or "product[]" in various ways.

I'm not too experienced in JS. Things like getElementById('product[]').selectedIndex are not working. I did a big search on the web, but found nothing that worked.

What I want to do ultimately is get the validation function to return false (i.e. a bad form submission) if what in the drop-down select box the user has selected is the first option.

Can anyone assist? Thanks in advance.

function checkform
if ( ??? )
alert("Please select an option");
return true;
return false;

<FORM ACTION="http://ww4.aitsafe.com/cf/add.cfm" METHOD="post" target="cart" onSubmit="return checkform()">
<INPUT TYPE="hidden" NAME="userid" VALUE="6887906">
<INPUT TYPE="hidden" NAME="product[]" VALUE="BLACKTSHIRT">
<INPUT TYPE="hidden" NAME="price" VALUE="22.00">
<font size="2">Size/font>
<select name="product[]" id="product[]">
<option selected>Select</option>
<input name="imageField22" type="image" src="images/add_to_cart.gif" width="70" height="30" border="0">