Mi a probléma a következő php/mysql függvénnyel?

function need($need, $from)

{

$result = mysql_query("SELECT '$need' FROM '$from'");

while ($row = mysql_fetch_row($result))

{

for ($i = 0; $i < sizeof($row); $i++)

{

print "$row[$i]";

}

}

}

Warning: mysql_fetch_row(): supplied argument is not a valid MySQL result resource in /home/uweb001/users_public/vary88/shefpage/lib/mysql_connect.php on line 13