function get_radio_value(field)
{
	for (var i=0; i < field.length; i++)
	{
		if (field[i].checked)
		{
			return field[i].value;
		}
	}

}
function get_value(field)
{
	return field.value;
}
function set_value(field, new_value)
{
	field.value = new_value;
}

function switch_element(element_id)
{
	var element = document.getElementById(element_id);
	
	if (element.style.display == "none") {
		element.style.display = "";
	} else {
		element.style.display = "none";
	}
}