function toggle_shipping_fields()
{
	var checkbox = document.getElementById("no_ship_chk");
	var shipfield = document.getElementById("encstore_shp_1");
	var i = 1;
	while(shipfield)
	{
		if(checkbox.checked)
			shipfield.name = 'shipping_' + i;
		else
			shipfield.name = 'disabled_shp_' + i;

		i++;
		shipfield = document.getElementById("encstore_shp_" + i);
	}
}