function auto_tab(original,destination) {
   if (original.getAttribute && original.value.length == original.getAttribute("maxlength"))
      destination.focus();
}
function auto_tab_num(keypress,original,destination) {
   if (((keypress >= 48) && (keypress <= 57)) || ((keypress >= 96) && (keypress <= 105))) {
      if (original.getAttribute && original.value.length == original.getAttribute("maxlength"))
         destination.focus();
   }
}
function number_only(keypress) {
   if ((String.fromCharCode(keypress) < "0") || (String.fromCharCode(keypress) > "9"))
      event.returnValue = false;
}
function float_only(keypress) {
   if (((String.fromCharCode(keypress) < "0") || (String.fromCharCode(keypress) > "9")) &&
      (String.fromCharCode(keypress) != ",") && (String.fromCharCode(keypress) != "."))
      event.returnValue = false;
}