function hide(purposeName, formatName)
{
  var purpose = document.getElementById(purposeName);
  
  if (purpose.options[purpose.selectedIndex].value == "h" || purpose.options[purpose.selectedIndex].value == "b")
  { 
    var format;
    if (format = document.getElementById(formatName))
    {
      format.style.visibility="visible";
      format.disabled=false;
     
      var label = document.getElementById(formatName + "Label");
      label.style.visibility="visible";
      label.disabled=false;
    }
  }
  else
  {
    var format;
    if (format = document.getElementById(formatName))
    {
      format.style.visibility="hidden";
      format.disabled=true;
      
      var label = document.getElementById(formatName + "Label");
      label.style.visibility="hidden";
      label.disabled=true;
    }
  }
}