I have been following the tutorials in the RSForms manual but am having trouble using check boxes.

I have a simple single item checkbox which has additional attributes set as below:

onclick=\"displayField('classA', this);\"

However, the 'if' clause to test the check box for 'checked' doesn't work. Any ideas what may be wrong with the 'if' line below?

I know the function is being called because if I set the 3rd line to display=\"none\" the table is hidden when I click the checkbox.

<script type=\"text/javascript\">
function displayField(tableName, className)
{

if(document.getElementsByName('form[className]')[0].checked == true)
document.getElementById(tableName).style.display=\"none\";

document.getElementById(tableName).style.display=\"\";

}
</script>

Oops sorry - the script actually looks like this

<script type=\"text/javascript\">

function displayField(tableName, className)
{
if(document.getElementsByName('form[className]')[0].checked == true)
document.getElementById(tableName).style.display=\"none\";
else
document.getElementById(tableName).style.display=\"\";
}

</script>