function readCookie(name) {
    var nameEQ = name + "=";
    var ca = document.cookie.split(';');
    //alert(document.cookie);

    for (var i=0; i < ca.length; i++) {
        var c = ca[i];
        while (c.charAt(0) ==' ') {        //charAt=文字列から指定した位置の文字を抜き出します
            c = c.substring(1,c.length);
            if (c.indexOf(nameEQ) == 0) {   //indexOf=文字列(c)から指定した位置の文字(nameEQ)を検索、参照します
                return c.substring(nameEQ.length,c.length);
            }
        }
    }
    return null;
}
function createCookie(name, value, mins) {
    // クッキーの保存期間（分）
    if (mins) {
        var date = new Date();
        date.setTime(date.getTime()+(mins*60*1000));
        var expires = "expires=" + date.toGMTString();
    } else {
        expires = "";
    }
    //alert(name + "=" + value + ";" + expires + "; path=/");
    document.cookie = name + "=" + value + ";" + expires + "; path=/";
    //alert(document.cookie);
}

var tab = {
    seltab :
    function (selected, max) {
        if (! document.getElementById) {
            return;
        }
        if (selected == null) {
            selected = 1;
        }
        if (max == null) {
            max = 5;
        }
        end = max;
        for (i = 1; i <= end; i++) {
            if (! document.getElementById('box' + i)) {
                continue;
            }
            if (i == selected) {
                if (i == end) {
                    document.getElementById('tab' + i).className = "opentab_end";
                } else {
                    document.getElementById('tab' + i).className = "opentab";
                }
                document.getElementById('box' + i).className = "openbox";
                // クッキー
                createCookie('tab_nm', i, 60);
                
            } else {
                if (i == end) {
                    document.getElementById('tab' + i).className = "closetab_end";
                } else {
                    document.getElementById('tab' + i).className = "closetab";
                }
                document.getElementById('box' + i).className = "closebox";
            }
        }
    }
    
}