JavaScript: checking for at least item on survey completed

http://www.webxpertz.net/forums/printthread.php?t=31724
function checkOne(frm ){
  var oneFilled = false ;
  for(var i = 0;i < frm.elements.length;i ++){
    switch(frm.elements[i].type ){
      case "text": oneFilled = frm.elements[i].value.length > 0 ;break;
      case "radio" :;
      case "checkbox":oneFilled = frm.elements[i].checked ;break;
      case "textArea":oneFilled = frm.elements[i].value.length > 0 ;break;
      case "select":oneFilled = frm.elements[i].selectedIndex > -1 ;break;
    }
    if(oneFilled ) break;
  }
  return oneFilled ;
}