function checkdata()	{
	var isSubmit = true;
	if ( document.forms['attend'].elements['name'].value == '' )	{
		isSubmit = false;
		window.alert('名前が入力されていません。');
	};
	if ( document.forms['attend'].elements['sid'].value == '' )	{
		isSubmit = false;
		window.alert('学籍番号が入力されていません。');
	} else {
		regex = new RegExp( "[0-9]{8}" );
		if ( ! regex.test(document.forms['attend'].elements['sid'].value) ){
			isSubmit = false;
			window.alert('学籍番号はすべて半角文字で、8桁で入力してください。');
		}
	}
	if ( isSubmit )	{
		document.cookie = "STNAME="+document.forms['attend'].elements['name'].value+"; expires=Tue, 1-Jan-2030 00:00:00 GMT;";
		document.cookie = "STID="+document.forms['attend'].elements['sid'].value+"; expires=Tue, 1-Jan-2030 00:00:00 GMT;";
	}
	return isSubmit;
}
function getCookie(key) {
    cookieAll = " " + document.cookie + ";";
    startPos = endPos = 0;
    len = cookieAll.length;
    while (startPos < len) {
        endPos = cookieAll.indexOf(";", startPos);
        oneKeyVal = cookieAll.substring(startPos + 1, endPos);
        eqPos = oneKeyVal.indexOf("=");
        if (oneKeyVal.substring(0, eqPos) == key) {
            return(unescape(oneKeyVal.substring(eqPos + 1, endPos - startPos - 1)));
        }
        startPos = endPos + 1;
    }
    return("");
}