var yesary, noary;

function updatechks() {
	var evlstr;
	if (yesary == null) return;
	for (var i = 1; i <= 24; i++) {
		// alert(yesary[i-1]);
		if (yesary[i-1] == "Y") {
			evlstr = "document.problemq.Q" + i + "Y.checked = true;";
		} else {
			evlstr = "document.problemq.Q" + i + "Y.checked = false;";
		}
		eval(evlstr);
		if (noary[i-1] == "Y") {
			evlstr = "document.problemq.Q" + i + "N.checked = true;";
		} else {
			evlstr = "document.problemq.Q" + i + "N.checked = false;";
		}
		eval(evlstr);
	}
}

function totcalc(YN) {
	var tot = 0;
	var chkary = "";
	for (var i = 1; i <= 24; i++) {
		var evlstr = "document.problemq.Q" + i + YN + ".checked";
		if (eval(evlstr)) {
			tot++;
			chkary += "Y";
		} else {
			chkary += "N";
		}
	}
	if (YN == "Y") {
		yesary = chkary;
	} else {
		noary = chkary;
	}
	return tot;
}

function calc(elm) {
	var str = elm.name, othername, evlstr;
	if (str.match("Y")) {
		othername = str.replace(/Y/,"N");
	} else {
		othername = str.replace(/N/,"Y");
	}
	if (elm.checked) {
		evlstr = "document.problemq." + othername + ".checked = false";
		eval(evlstr);
	}
	var yestot = totcalc('Y');
	SetCookie('DYHPY', yesary, null, "/");
	var notot = totcalc('N');
	SetCookie('DYHPN', noary, null, "/");
	if (yestot > 0 || notot > 23) {
		document.getElementById("totY").innerHTML = yestot;
	} else {
		document.getElementById("totY").innerHTML = "";
	}
}

function getCookieVal(offset) {
	var endstr = document.cookie.indexOf (";", offset);
	if (endstr == -1) {
		endstr = document.cookie.length;
		// alert ("endstr is " + endstr);
	}
	return unescape(document.cookie.substring(offset, endstr));
}

function GetCookie (name) { 
	var arg = name + "="; 
	var alen = arg.length; 
	var clen = document.cookie.length; 
	var i = 0; 
	while (i < clen) { 
		var j = i + alen; 
		if (document.cookie.substring(i, j) == arg) 
			return getCookieVal (j); 
		i = document.cookie.indexOf(" ", i) + 1; 
		if (i == 0) break; 
	} 
	return null;
}

function SetCookie (name, value) { 
	var argv = SetCookie.arguments; 
	var argc = SetCookie.arguments.length; 
	var expires = (argc > 2) ? argv[2] : null; 
	var path = (argc > 3) ? argv[3] : null; 
	var domain = (argc > 4) ? argv[4] : null; 
	var secure = (argc > 5) ? argv[5] : false; 
	document.cookie = name + "=" + escape (value) + ((expires == null) ? "" : ("; expires=" + expires.toGMTString())) + 
	((path == null) ? "" : ("; path=" + path)) + ((domain == null) ? "" : ("; domain=" + domain)) + ((secure == true) ? "; secure" : "");
}

function DeleteCookie (name) { 
	var exp = new Date(); 
	exp.setTime (exp.getTime() - 1);
	var cval = GetCookie (name); 
	document.cookie = name + "=" + cval + "; expires=" + exp.toGMTString();
}