function channel(number)
{
    for (i = 1; i <= 4; i++)
    {
        if (i == number)
        {
            document.getElementById("s_btn" + number).src = "./images/content_l_s_" + number + "b.gif";
            document.getElementById("content_l_txt").src = "./images/content_l_3_" + number + ".gif";
            document.getElementById("s_form" + number).style.display = "block";
        } else
        {
            document.getElementById("s_btn" + i).src = "./images/content_l_s_" + i + ".gif";
            document.getElementById("s_form" + i).style.display = "none";
        }
    }
}

function infomenu(number)
{
    if (number == 1)
    {
        document.getElementById("info1").style.display = "block";
        document.getElementById("info2").style.display = "none";
    }
    if (number == 2)
    {
        document.getElementById("info1").style.display = "none";
        document.getElementById("info2").style.display = "block";
    }
}