var isNN = (navigator.appName.indexOf("Netscape")!=-1);
function autoTab(input,len, e){
  var keyCode = (isNN)?e.which:e.keyCode; 
  var filter = (isNN)?[0,8,9]:[0,8,9,16,17,18,37,38,39,40,46];
  if(input.value.length >= len && !containsElement(filter,keyCode)){
    input.value = input.value.slice(0,len);
	// adaugat ca sa evite hidden fields, deci un JavaScript error
	var ind = (getIndex(input)+1)%input.form.length;
	if(input.form[ind].type == 'hidden')
	{
//		alert('got it');
		ind++;
	}
    input.form[ind].focus();
  }
  function containsElement(arr, ele){
    var found = false, index = 0;
    while(!found && index < arr.length)
      if(arr[index]==ele)
        found = true;
      else
        index++;
    return found;
  }
  function getIndex(input){
    var index = -1, i = 0, found = false;
    while (i < input.form.length && index==-1)
      if (input.form[i] == input)index = i;
      else i++;
    return index;
  }
  return true;
}