How to create an array text box to lessen the codes

How to create an array text box to lessen the codes
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I have a total of four IP addresses that may (optional not mandatory) to be filled in.
Each Ip address have four separate fields. This gives a total
of 16 fields. The code below showed that codes has to be
written for these individual fields.

1) Is there a way to declared in HTML that these fields are arrays
so that I could access them by subscript (ex: array[1] to array[16]) to lessen the codes ?

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[code]
<script LANGUAGE="Javascript">
<!--

function check_for_all_0_and_all_255(ip_address)
{

  if (ip_address.name == "ip1" ||ip_address.name == "ip2" ||
      ip_address.name == "ip3" ||ip_address.name == "ip4")
    {
      field_name_1 = "ip1";
      field_name_2 = "ip2";
      field_name_3 = "ip3";
      field_name_4 = "ip4";
    }

  if (ip_address.name == "ip1opt" ||ip_address.name == "ip2opt" ||
      ip_address.name == "ip3opt" ||ip_address.name == "ip4opt")
    {
      field_name_1 = "ip1opt";
      field_name_2 = "ip2opt";
      field_name_3 = "ip3opt";
      field_name_4 = "ip4opt";
    }

  if (ip_address.name == "ip1opt1" ||ip_address.name == "ip2opt1" ||
      ip_address.name == "ip3opt1" ||ip_address.name == "ip4opt1")
    {
      field_name_1 = "ip1opt1";
      field_name_2 = "ip2opt1";
      field_name_3 = "ip3opt1";
      field_name_4 = "ip4opt1";

    }

  if (ip_address.name == "ip1opt2" ||ip_address.name == "ip2opt2" ||
      ip_address.name == "ip3opt2" ||ip_address.name == "ip4opt2")
    {
      field_name_1 = "ip1opt2";
      field_name_2 = "ip2opt2";
      field_name_3 = "ip3opt2";
      field_name_4 = "ip4opt2";

  converted_ip1 = parseInt(document.form1[field_name_1].value)
  converted_ip2 = parseInt(document.form1[field_name_2].value)
  converted_ip3 = parseInt(document.form1[field_name_3].value)
  converted_ip4 = parseInt(document.form1[field_name_4].value)

  if (converted_ip1 == 0 && converted_ip2 == 0 && converted_ip3 == 0 && converted_ip4 == 0)
    {
      alert ("The IP value cannot be 0.0.0.0");
      document.form1[field_name_1].value = "";
      document.form1[field_name_2].value = "";
      document.form1[field_name_3].value = "";
      document.form1[field_name_4].value = "";
      return false;
    }

  if (converted_ip1 == 255 && converted_ip2 == 255 && converted_ip3 == 255 && converted_ip4 == 255)
    {
      alert ("The IP value cannot be 255.255.255.255");
      document.form1[field_name_1].value = "";
      document.form1[field_name_2].value = "";
      document.form1[field_name_3].value = "";
      document.form1[field_name_4].value = "";
      return false;
    }
}

  <input type=text size=3 maxlength=3 name=ip1 onkeyup='only_numbers(ip1)' onblur='check_for_over_255(ip1); check_for_all_0_and_all_255(ip1)' value="<?=$lv_ip01?>">&nbsp;<b>.</b>
  <input type=text size=3 maxlength=3 name=ip2 onkeyup='only_numbers(ip2)' onblur='check_for_over_255(ip2); check_for_all_0_and_all_255(ip2)' value="<?=$lv_ip02?>">&nbsp;<b>.</b>
  <input type=text size=3 maxlength=3 name=ip3 onkeyup='only_numbers(ip3)' onblur='check_for_over_255(ip3); check_for_all_0_and_all_255(ip3)' value="<?=$lv_ip03?>">&nbsp;<b>.</b>
  <input type=text size=3 maxlength=3 name=ip4 onkeyup='only_numbers(ip4)' onblur='check_for_over_255(ip4); check_for_all_0_and_all_255(ip4)' value="<?=$lv_ip04?>">
  </td>

//-->
</SCRIPT>

[/code]