auto meta tag plugin need help

Hii

i found adding auto meta tag plugin
http://www.raoul.shacknet.nu/2006/01/05/add-meta-tags-wordpress-plugin

problem is it show description as first few word from post and category name as keyword

i like to show post title as descrption do its possible to modify the code

present code in the plugin

function amt_add_meta_tags() {
global $posts;

if ( is_single() ) {
// Description
$my_metatags = “\n<meta name=\”description\” content=\”” . strip_tags(get_the_excerpt()) . “\” />”;
// Keywords
$my_metatags .= “\n<meta name=\”keywords\” content=\””;
foreach((get_the_category($posts[0]->ID)) as $cat) {
$my_metatags .= $cat->category_nicename . ‘, ‘;
}
$my_metatags = substr($my_metatags, 0, -2) . “\” />\n”;
}
echo $my_metatags;
}

add_action(‘wp_head’, ‘amt_add_meta_tags’);

?>