// JavaScript Document
function update_price_up(name){
	var current_value = document.getElementById(name).value;
	var new_value = parseInt(current_value)+1;
	document.getElementById(name).value = new_value;
	return false;
}
function update_price_down(name){
	var current_value = document.getElementById(name).value;
	if(current_value > 0){
		var new_value = parseInt(current_value)-1;
		document.getElementById(name).value = new_value;
	}
	return false;
}