var shutterType, width, height = 0;
$("#qqShutterType, #qqWidth, #qqHeight").change(function(){
	shutterType = $("#qqShutterType").attr("value");
	width = $("#qqWidth").attr("value");
	height = $("#qqHeight").attr("value");
	var result = (shutterType * (width / 1000) * (height / 1000));
	var discountPrice = (result * currentDiscount);

	if(shutterType && width && height) {
		$("#qqCost").html(result.toFixed(2));
		$("#qqDiscount").html(discountPrice.toFixed(2));
		$("#qqTotalCost").html((result -  discountPrice + 45).toFixed(2));
	}
	else {
		$("#qqCost, #qqDiscount, #qqTotalCost").attr("value", " -");
	}
});

if($("#heardAbout").val() != 'other') $("#heardAboutSpec").attr("disabled", "disabled");

$("#heardAbout").change(function () {
	if(this.value == "other") {
		$("#heardAboutSpec").removeAttr("disabled");
	}
	else {
		$("#heardAboutSpec").attr("disabled", "disabled");
	}
});