In sostanza penso che bisognerebbe annidare un'altro cilo for all'interno dello script solo che non capisco esattamente come fare...

I dati dovrebbero essere divisi da una tabella in modo che la metà vada da una parte e l'altra dall'altra, vi provo a postare il codice

[PHP]<?php

require_once("initvars.inc.php");
require_once("config.inc.php");

?>
<table width="100%"><tr><td valign="top">
<?php

// Show city list

if($location_sort)
{
$sort1 = "ORDER BY countryname";
$sort2 = "ORDER BY cityname";
}
else
{
$sort1 = "ORDER BY c.pos";
$sort2 = "ORDER BY ct.pos";
}

if ($show_region_adcount || $show_city_adcount)
{
// First get ads per city and country
$country_adcounts = array();
$city_adcounts = array();
$sql = "SELECT ct.cityid, c.countryid, COUNT(*) as adcnt
FROM $t_ads a
INNER JOIN $t_cities ct ON ct.cityid = a.cityid AND ($visibility_condn)
INNER JOIN $t_countries c ON ct.countryid = c.countryid
WHERE ct.enabled = '1' AND c.enabled = '1'
GROUP BY ct.cityid";

$res = mysql_query($sql) or die(mysql_error().$sql);

while($row=mysql_fetch_array($res))
{
    $country_adcounts[$row['countryid']] += $row['adcnt'];
    $city_adcounts[$row['cityid']] += $row['adcnt'];
}

}

$sql = "SELECT * FROM $t_countries c INNER JOIN $t_cities ct ON c.countryid = ct.countryid AND ct.enabled = '1' WHERE c.enabled = '1' GROUP BY c.countryid $sort1";
$resc = mysql_query($sql);

$country_count = mysql_num_rows($resc);
//$split_at = ($country_count%3?((int)($country_count/3))+2:($country_count/3)+1);
$percol = floor($country_count/$location_cols);
$percolA = array();
for($i=1;$i<=$location_cols;$i++) $percolA*=$percol+($i<=$country_count%$location_cols?1:0);

$i = 0; $j = 0;
$col = 1;
while($country = mysql_fetch_array($resc))
{
/* Begin Version 5.0 /
$country_url = buildURL("main", array((0-$country['countryid']), $country['countryname']));
/ End Version 5.0 */
?>

<div><a href="<?php echo $country_url; ?>" class="citylist_country"><?php echo $country['countryname']; ?> <?php if($show_region_adcount) echo "(".(0+$country_adcounts[$country['countryid']]).")"; ?></a></div>


<?php

if($country['countryid'] == $xcountryid || !$expand_current_region_only)
{

    $sql = "SELECT * FROM $t_cities ct WHERE countryid = $country[countryid] AND enabled = '1' $sort2";
    $resct = mysql_query($sql);
    
    /* Begin Version 5.0 */
    $citycount = mysql_num_rows($resct);
    /* End Version 5.0 */

    while($city=mysql_fetch_array($resct))
    {        
        /* Begin Version 5.0 */
        if ($shortcut_regions && $citycount == 1 
                && $city['cityname'] == $country['countryname']) {
            continue;
        }
        
        $city_url = buildURL("main", array($city['cityid'], $city['cityname']));
        /* End Version 5.0 */

?>

        <a href="<?php echo $city_url; ?>" class="citylist_city"><?php echo $city['cityname']; echo "$xcountryid"; ?></a><br>
        
<?php

    }
}

?>


<?php

$i++; $j++;
//if($i%$split_at == 0) echo "</td><td valign=\"top\">";
if ($j%$percolA[$col]==0 && $i<$country_count) { echo "</td><td valign=\"top\">"; $col++; $j=0; } 

}

?>

</td></tr></table>[/PHP]