$lvarcontributor = "SELECT * FROM  dD_Contributors WHERE idAlbum = '".$idAlbum."' ORDER BY idContributor ASC";
$lvarresult=mysql_query($lvarcontributor);
$var = 0;
while ($lvarrow = mysql_fetch_array($lvarresult))
    {
    $var++;
//STUFF HERE...
}

If($var == "LAST RESULT") {
//do this
}

if (($var + 1) == musql_num_rows($result))
{
   //this is the last row
}

if( $var == mysql_num_rows($lvarresult) - 1 ) {
    // this is the last row, do your thing
}

$lvarcontributor = "SELECT * FROM  dD_Contributors WHERE idAlbum = '".$idAlbum."' ORDER BY idContributor DESC LIMIT 1";

$nextRow = mysql_fetch_array($lvarresult);
while ($nextRow)
{
   $currentRow = $nextRow;
   if($nextRow = mysql_fetch_array($lvarresult)) {
        //Not the last row, data in $currentRow
   }
   else {
        //Last row, data in $currentRow
   }
}