ok, try using this for the script:
<script type="text/javascript">
function addToBasket(form) {
var isChecked = false;
var chks = document.getElementsByName('atccheck[]');
if ( chks.checked == true) {
isChecked = true;
}
else {
for ( var i=0; i < chks.length; i++) {
if ( chks[i].checked == true ) {
isChecked = true;
break;
}
}
}
if ( isChecked == false ) {
alert("Please select a spring. Then press 'Add to Basket'.");
}
return isChecked;
}
</script>
and this for the submit button:
<input name="submit" type="submit" value="Add to Cart" onclick="return addToBasket()" />
