code Works in IE but not Netscape??

I developed coding to pullout which check boxes were selected. This was done in I E. after completing and debugging the code I put it on the web page and then tried it in Netscape 4. and Netscape 6. It does not work in either Netscape. I would like someone would tell me what I did the wrong.
Netscape, in debug, gives an error on the name property, when something has been selected
The coding follows
function goahead()
{
counter = 0
var form = document.forms[0]

for (i = 0; i < form.elements.length; i++)
{
if (form.elements[i].type == "checkbox" && form.elements[i].checked )
{
counter ++
selection = selection +form.elements(i).name+ ", "
form.elements(i).checked = false
}}
if (counter ==0)
{
alert( "You have not selected any concerns, there is nothing to send. If you wan to contact us click on -Contact us - from the home page")
}
else
{
alert("You are requesting aditional informqtion. Please click - send email - and enter your name and email address so we can get back to you on your concerns")
//write selection here then clear
form.sendit.focus()
setCookie("concerns=", selection, today, path, domain, secure)
selection = ""

} }
The coding can also be found at www.healthandwealthplus.com, and selecting
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