PHPR 6 Bug ?

It works in phpr 5.3 and when upgrade to phpr 6.0b, it does not work anymore and

gives error: mysql_query() expects parameter 2 to be resource, object given
in the the events.php, i have the following lines:
$strSQL1 = "select distinct id from XX where id =".$_SESSION["id"];

$result = mysql_query($strSQL1,$conn) or die(mysql_error());

$row_count1 = mysql_num_rows($result);
if ($row_count1 == 0)

{

echo ">0"

}

ELSE

{

echo "<0";

}
To make it work, i have to change the codes to the following:
$link = mysql_connect("127.0.0.1", "abc", "abc1234");

mysql_select_db("customer", $link);

$result = mysql_query($strSQL1, $link) or die(mysql_error());

$row_count1 = mysql_num_rows($result);

if ($row_count1 == 0)

{

echo ">0";

}

ELSE

{

echo "<0";

}
Is there anything i missed? seems the $conn variable does not work like previously in phpr5.3,

then i have to replace all the original codes. Pls advise.