function calcPrice()
{
	var minPrice = 8.00;
	var price1 = 2.00;
	var price2 = 1.50;
	var description = "";
	var total = 0;
	
	var d = document.getElementById("distance").value;
	if (d!="") 
	{
		d = parseFloat(d);
		if (isNaN(d)) 
		{
			document.getElementById("price").innerHTML = "Nan";
			return;
		}
	}
	
	total = (d<=10)*(d*price1) + (d>10)*(10*price1 + (d-10)*price2);
	total = (total<minPrice ? minPrice.toFixed(2) : total.toFixed(2)) + "";	
	document.getElementById("price").innerHTML = description + total;
}