function update_total(value)
{
	quantity = parseInt(value);
	if (!quantity) quantity = 0;
	/* Price */
	var price = 39;
	
	if (quantity>1)
	{
		base = quantity - 1;
		if (base > 58) base = 59;
		discount = 0.03 + base * 0.007;
		price = price - (price * discount);
	}

	document.getElementById("price").innerHTML = '× $'+price.toFixed(2);
	total = quantity * price;
	document.getElementById("total").innerHTML = '$'+total.toFixed(2);
}

function focused(object, placeholder) {
	if(object.value == placeholder) {
		object.value = '';
		object.className = '';
	}
}

function blurred(object, placeholder) {
	if(object.value == '') {
		object.value = placeholder;
		object.className = 'placeholder';
	}
}