<!-- Begin
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);
          input.form[(getIndex(input)+1) % input.form.length].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;
}
//  End -->