[PHP] previous and next link

[phpu]

I've tried but i don't know how to put it in my script. And also i don't know  how to 
display it in page. Here is my script and I hope you could help me with this one.
thanks


$sql = "SELECT * FROM categorie" ;
$rezultat = mysql_query($sql); 
$num_rows = mysql_num_rows($rezultat);

while ($row=mysql_fetch_array($rezultat)) {


     print ' <tr><td>'.$row['nume_categorie'].'</td></tr>';
      
}