// 
function parseQuery(){
	var q=location.search.substr(1);
	var i=q.indexOf('a1=');
	if(i!=-1) return q.substr(i+3,1);
	return '';
}

function getRadioValue(name){
	var aRadio = document.getElementsByName(name);
	for (var j=0; j<aRadio.length; j++) {
		if(aRadio[j].checked) return aRadio[j].getAttribute("value");
	}
	return '';
}


// 
function showNext(){
	if(getRadioValue("a1") =="") {
		alert("選択肢から一つ選んでください");
		return false;
	}
}


// 
function showResult(vol){
	
	if(getRadioValue("a2") =="") {
		alert("選択肢から一つ選んでください");
		return false;
	}
	
	var a1 = parseQuery();
	var a2 = getRadioValue("a2");
	
	var r_h = (vol == 2) ? 7 : 8;
	var r_l = 3;
		
	var s1 = a1*1;
	var s2 = a2*1;
	var r = s1+s2;
	
	var url = (r>=r_h*1) ? "result1.htm"
		: (r<=r_l*1) ? "result3.htm"
		: "result2.htm";

	location.href = url;
}