while ( $blockEnd <= $end ) {
$this->output( "...doing page_id from $blockStart to $blockEnd\n" );
$cond = "page_id BETWEEN $blockStart AND $blockEnd";
while ( $blockEnd <= $end ) {
$this->output( "...doing page_id from $blockStart to $blockEnd\n" );
$cond = "page_id BETWEEN $blockStart AND $blockEnd";