$host= "localhost";
$user= "xxxxx";
$pass= "xxxx";
$db="xxxxx";

$connect= mysql_connect($host,$user,$pass);
if (!$connect)die ("Cannot connect!");
mysql_select_db($db, $connect);

$result = mysql_query("
    SELECT
        *
    FROM
        url
");

if($result){
    while($row = mysql_fetch_array($result, MYSQL_ASSOC)){

$url = $row['urlss'];
echo '<li>'.$url.'</li>';
}
}

row1
row2
row3
row4

row1
//wait 5 sec
row2
//wait 5 sec
row3
//wait 5 sec
row4
//wait 5 sec