Something

<?
include("functions.php");

$sql = "select * from blogg order by bloggid";

$result = mysql_query($sql) or die(mysql_error());

while($object = mysql_fetch_object($result))
{
        $correctbr = str_replace("<br>", "<BR />", "$object->blogg");
        $correctbr = str_replace("<BR>", "<BR />", "$correctbr");

        $sql = "update blogg set blogg = '$correctbr' where bloggid = $object->bloggid";
        mysql_query($sql) or die(mysql_error()."Fel vid hantering av".$object->bloggid);

}
?>