function showsubmenu(sid)
{
    for(var i = 1; i <= 9; i++)
    {
        if(i == sid)
        {
            if(document.getElementById("submenu" + i).className != "block submenu" + i)
			    document.getElementById("submenu" + i).className = "block submenu" + i;
        }
        else
        {
            if(document.getElementById("submenu" + i).className != "hidden")
			    document.getElementById("submenu" + i).className = "hidden";
        }
    }
}