function getElementValue(ref){
try{
  if (ref==null){
      return "";
  }else{
      return ref;
  }
}catch(Exception){
}
}

function isNumber(item, name) {
  var inputVal = item.value;
  inputStr = inputVal.toString();
  for (var i = 0; i < inputStr.length; i++) {
    var oneChar = inputStr.charAt(i);
    if (oneChar < '0' || oneChar > '9') {
            item.focus();
            return false;
    }
  }
  return true;
}