function isnum(s, f)
{
 if(!f && (s == '')) return false;

 for(var i = 0; i < s.length; i++)
 {
  var c = s.charAt(i);
  if((c < '0') || (c > '9')) return false;
 };

 return true;
};

function isblank(s)
{
 for(var i = 0; i < s.length; i++)
 {
  var c = s.charAt(i);
  if((c != ' ') && (c != '\n') && (c != '')) return false;
 };
 return true;
};

function checkall(f)
{
  var i;
  var e;

  i = 0;
  do {
    e = document.getElementById('c' + i);
    if(e)
    {
      e.checked = f;
      i++;
    }
  } while(e);
  return false;
}

function getmsel(o)
{
  var s;
  s = "";
  for(i = 0; i < o.options.length; i++)
  {
    if(o.options[i].selected)
    {
      if(s.length) s += ",";
      s += o.options[i].value;
    }
  }
  return s;
}

function getcsel()
{
  var i = 0;
  var s = "";
  var e;

  do {
    e = document.getElementById('c' + i);
    if(e && e.checked)
    {
      if(s.length) s += ",";
      s += e.value;
    }
    i++;
  } while(e);

  return s;
}

function toggle(n)
{
  var e;
  e = document.getElementById(n);
  if(e)
  {
    if(e.style.display == "none")
    {
      e.style.display = "inline";
    } else {
      e.style.display = "none";
    }
  }
  return false;
}