function toFrame(frameset, frame)
{
    if (parent == self)
    {
        var url = escape(location.href);
        var str;
        for (var i = 0, str = ''; i < url.length; i++)  {
            if (url.charAt(i) == '/') 
                str += '%2F';
            else 
                str += url.charAt(i);
        }
        replace(frameset, frame, str);
    }
}

function replace(action, frame, str)
{
    var url = action + '?' + frame + '=' + str;
    location.href = url;
}

function toMain(frameset)
{
    toFrame(frameset, 'main');
}