var convert = function (strInput) {
	strInput = strInput.toLowerCase();
   
	var amount = parseFloat(strInput, 10);
 	var strAmount = strInput.replace(amount, "").trim();

	switch (strAmount) {
		case "pounds":
		case "pounds":
		case "lb":
		case "lbs":
 			return amount * 0.454 + " kg";
		case "miles":
		case "mile":
			return amount * 1.61 + " km";
		default:
			return undefined;
	}

};