function loadSheets($BookId) {
$sql = "select SheetId from ".table('sheets'). " where BookId=$BookId" ;
$result = mysql_query($sql);
if (!$result) {
$error = new GsError(302,"Error loading book.");
if($error->isDebugging()){
$err = str_replace("'", '"', mysql_error());
$error->addContentElement("BookId",$BookId);
$error->addContentElement("MySql Error",$err);
}
throw $error;
}
while ($row = mysql_fetch_object($result)){
$sheet = new Sheet();
$sheet->load($row->SheetId);
$this->addSheet($sheet);
}
}