function autotab(fn, fl) {
   var i;
   var j;
   var next;
   var cell;
      
   j = -1;
   for (i = 0; i < document.form1.length; i ++) {
      if (document.form1.elements[i].name == fn.name) {
         j = i;
      }
   }
   if (j != -1) {
      next = j + 1;
    
      if (next >= document.form1.length) {
         next = 0;
      }
      cell = document.form1.elements[j].value;
      if (cell.length == fl) {
         document.form1.elements[next].focus();
      }
   }
}