Vote function help?

How can change this function to only pull posts from a category? say category “7” and only 10 posts:

Function called in top 10 posts page

<?php $pageposts = ShowPostByVotes(); ?>
<?php if ($pageposts): ?>
<?php foreach ($pageposts as $post): ?>
<?php setup_postdata($post); ?>
print content etc…..
<?php endforeach; ?>

<?php else : ?>
no posts exist please etc…….
<?php endif; ?>

In the plugin functions file:

//Sort posts by vote amount
function ShowPostByVotes() {
global $wpdb, $voteiu_databasetable;

mysql_connect(DB_HOST, DB_USER, DB_PASSWORD) or die(mysql_error());
mysql_select_db(DB_NAME) or die(mysql_error());
//Set a limit to reduce time taken for script to run
$upperlimit = get_option(‘voteiu_limit’);
if ($upperlimit == ”) {
$upperlimit = 100;
}
$lowerlimit = 0;

$votesarray = array();
$querystr = “
SELECT *
FROM $wpdb->posts
WHERE post_status = ‘publish’
AND post_type = ‘post’
ORDER BY post_date DESC
“;
$pageposts = $wpdb->get_results($querystr, OBJECT);
//Use wordpress posts table
//For posts to be available for vote editing, they must be published posts.
mysql_connect(DB_HOST, DB_USER, DB_PASSWORD) or die(mysql_error());
mysql_select_db(DB_NAME) or die(mysql_error());
//Sorts by date instead of ID for more accurate representation
$posttablecontents = mysql_query(“SELECT ID FROM “.$wpdb->prefix.”posts WHERE post_type = ‘post’ AND post_status = ‘publish’ ORDER BY post_date_gmt DESC LIMIT “.$lowerlimit.”, “.$upperlimit.””) or die(mysql_error());

$returnarray = array();
while ($row = mysql_fetch_array($posttablecontents)) {
$post_id = $row[‘ID’];
$vote_array = GetVotes($post_id, “array”);
array_push($votesarray, array(GetVotes($post_id)));
}
array_multisort($votesarray, SORT_DESC, $pageposts);
$output = $pageposts;
return $output;

}