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<script language="JavaScript" type="text/javascript">
<!--




function checkNum(data) {
	if (data.length == 0) {
		return (false);
	}
	var valid = "0123456789.";
	for (var i = 0; i<data.length; i++){
		tempChar = data.substring (i, i+1);
		if (valid.indexOf(tempChar, 0) == -1) {
			return (false);
		}
	}
	return (true);
}

function calcCost(inField) {
	var temp = checkNum(inField.mileage.value);
	if (temp == 1) {
		var mileage = eval(inField.mileage.value);
	}
	else {
		alert("You must enter a 'Valid Number' for your Mileage.");
		return false;
	}
	var temp1 = checkNum(inField.mpg.value);
	if (temp1 == 1) {
		var mpg = eval(inField.mpg.value);
	}
	else {
		alert("You must enter a 'Valid Number' for your Miles Per Gallon.");
		return false;
	}

	var temp2 = checkNum(inField.petrolPrice.value);
	if (temp2 == 1) {
		var petrolPrice = eval(inField.petrolPrice.value);
	}
	else {
		alert("You must enter a 'Valid Price' for your Petrol Cost.");
		return false;
	}

	var temp3 = checkNum(inField.lpgPrice.value);
	if (temp3 == 1) {
		var lpgPrice = eval(inField.lpgPrice.value);
	}
	else {
		alert("You must enter a 'Valid Price' for your Liquified Petroleum Gas (LPG).");
		return false;
	}
	var Petrolmpl = mpg/4.55;
	var LPGmpl = Petrolmpl*0.9;

	var totalPetrolCost= (mileage/Petrolmpl)*(petrolPrice/100);
	var totalLPGcost= (mileage/LPGmpl)*(lpgPrice/100);

	totalPetrolCost = Math.floor(totalPetrolCost);
	totalLPGcost = Math.floor(totalLPGcost);
	var saving = totalPetrolCost - totalLPGcost;
	saving = Math.floor(saving);

	inField.petrol.value = totalPetrolCost;
	inField.lpg.value = totalLPGcost;
	//inField.lpg.value = "£" + totalLPGcost;
	inField.saving.value = saving;

	return true;
}
//-->
</script>

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