function set_action(param, act)
{
  param.form.act.value = act;
  param.form.target = '_self';
  param.form.submit();
}

function select_all(param)
{
    form_length = param.form.length;
    for (i=0;i<form_length;i++)
    {
        if (param.form.item(i).type == 'checkbox')
        {
            param.form.item(i).checked = true;
        }   
    }
}