<?
$username="*************";
$password="***************";
$database="****************";

mysql_connect("***************",$username,$password);
@mysql_select_db($database) or die( "Unable to select database");
$query="SELECT product_name, url FROM product WHERE product_name like 'Day You Were%' group by product_name order by product_name";

echo "<form action=\"https://www.paypal.com/cgi-bin/webscr\" target=\"paypal\" name=\"mygallery\" method=\"post\">";

/* You can add order by clause to the sql statement if the names are to be displayed in alphabetical order */

$result = mysql_query ($query);
echo "<font color=\"#FF0000\">1.</font> Select The Gift You Would Like:<br><select name=\"gift\" onChange=\"go()\">";
// printing the list box select command

while($nt=mysql_fetch_array($result)){//Array or records stored in $nt

echo "<option label=\"$nt[product_name]\" value=\"$nt[url]\">$nt[product_name]</option>";
/* Option values are added by looping through the array */
}
echo "</select>";// Closing of list box
?>

$pageTitle = 'Day You Were Married';
// this is for testing, I expect this variable to be filled somewhere else in your code
$preSelect[$pageTitle] = ' selected';
// $preSelect was an empty array, now it has just one item. I use this trick for pre-selecting options
 
... while ...
printf('<option label="%s" value="%s"%s>%s</option>',
   $nt['product_name'], $nt['url'], $preSelect[ $nt['product_name'] ], $nt['product_name']);