[wp-hackers] any idea why this custom rewrite isnt working?

[Chris McCoy]

// multiple keywords works fine domain.com/search/keyword-keyword2.html

from : loop-search.php

$search_query = str_replace('-',' ', $wp_query->query_vars['s']);
$mysearch = new WP_Query("s=$search_query&showposts=-1"); 

// multiple tag doesnt work domain.com/tag/tag-tag2.html

from: loop-tag.php

$tag_query = str_replace('-',',',$wp_query->query_vars['tag']); 
$mytag = new WP_Query("tag=$tag_query&showposts=-1");

// rewrites

add_action('generate_rewrite_rules', 'hotlinkers_add_rewrite_rules'); 

function hotlinkers_add_rewrite_rules( $wp_rewrite ) { 
    $new_rules = array(
    "^search/(.+)\.html$" => 'index.php?s=' . $wp_rewrite->preg_index(1),
    "^tag/(.+)\.html$" => 'index.php?tag=' . $wp_rewrite->preg_index(1)
    );
    $wp_rewrite->rules = $new_rules + $wp_rewrite->rules; 
} 

add_filter('query_vars', 'hotlinkers_queryvars' ); 

function hotlinkers_queryvars( $qvars ){ 
    $qvars[] = 's'; 
    $qvars[] = 'tag'; 
    return $qvars; 
} 

add_action('init','hotlinkers_flush_rules'); 

function hotlinkers_flush_rules(){ 
    global $wp_rewrite; 
    $wp_rewrite->flush_rules(); 
}

Thanks ;)