function showSubMenu(id,count) {
    for (i=1;i<count+1;i++) {
        if (document.getElementById('mn_'+i)) {
            document.getElementById('mn_'+i).style.display='none';
            document.getElementById('mn_but_'+i).className='';
        }
        document.getElementById('mn_but_'+i).className='';
    }
    if (document.getElementById('mn_'+id))
        document.getElementById('mn_'+id).style.display='block';

    if (id==count)
        document.getElementById('mn_but_'+id).className='';

    document.getElementById('mn_but_'+id).className='act';
}