function yodocalc(){

	var webprice,tempoprice,otherprice;

	webprice = document.f1.ywp.value;
	tempoprice = document.f1.ytp.value;
	otherprice = document.f1.otp.value;

	if(	isNaN(webprice) ||
		isNaN(tempoprice) ||
		isNaN(otherprice) ){

		alert("数値を入力してください。");
	}

	if(	webprice<0 ||
		tempoprice<0 ||
		otherprice<0 ){
		alert("正しい金額を入力してください。");
	}

	document.f1.ywn.value = webprice * document.f1.ywk.value /100;
	document.f1.ywa.value = webprice - document.f1.ywn.value;
	document.f1.ytn.value = tempoprice * document.f1.ytk.value /100;
	document.f1.yta.value = tempoprice - document.f1.ytn.value;
	document.f1.wvt.value = document.f1.yta.value - document.f1.ywa.value;
	document.f1.wvo.value = document.f1.otp.value - document.f1.ywa.value;
	document.f1.tvo.value = document.f1.otp.value - document.f1.yta.value;
	if(webprice == 0){
		document.f1.wvt.value = document.f1.wvo.value = "---";
	}
	if(tempoprice == 0){
		document.f1.wvt.value = document.f1.tvo.value = "---";
	}
	if(otherprice == 0){
		document.f1.wvo.value = document.f1.tvo.value = "---";
	}

}