function getObject(_strName) {
	// function used to easily support all browsers, IE uses document.all, Firefox, safari etc uses document.getElementById
	if (document.all) {
		return document.all[_strName];
	} else if (document.getElementById) {
		return document.getElementById(_strName);
	}
}

function upgrade(_intProduct) {
	getObject("upgrade").value = _intProduct;
	getObject("paymentform").submit();
}