function accordion(obj, acc_id)
{
    ACC = document.getElementById(acc_id);
    arr = ACC.getElementsByTagName('li');
    
    for(i=0;i<arr.length;i++)
    {
        if(arr[i].className=='cat off' || arr[i].className=='cat on')
        {
            arr[i].className='cat off';
        }
    }
    
    obj.className='cat on';
}