$browser->get( $starting_url );
$browser->form_name("GS");
$browser->submit();

##</code><code>##

<form name="gs" METHOD="post" action="" onSubmit="cntyzip()" >
  <table width=70% align="center">
    <tr>
      <td align=center colspan=2> You must either choose a <b>County <font
		color="#FF0000"> &nbsp;or&nbsp;</font></b> enter a <b>Zip Code</b></td></tr>
	 <tr><td>&nbsp;</td></tr>
    <tr>
      <td colspan="2"> <table width = 76% align="center">
          <tr>
            <td width="16%" align=left><font size=2>County:</font></td>
            <td width="30%" align=left><font size=2>
              <select name="county">
                <option value="">Choose a county</option>
                <option value="01ATLANTIC">ATLANTIC</option>

##</code><code>##

$browser->form_name( "gs" );
   $browser->set_fields(
       county => '01ATLANTIC'
       
   );
   $browser->submit();

# $browser->form_name("gs");
# $browser->field( "county", "01ATLANTIC" );
#  $browser->cntyzip();