function change_amt_archive

<?php
function add_jquery_to_head(){
wp_deregister_script('jquery');// unregister default wp jquery
wp_register_script('jquery','http://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js');//set our version as the new jquery
wp_enqueue_script('jquery');// then load it
}
add_action('template_redirect', 'add_jquery_to_head');

/* original sorting function from : http://blog.rutwick.com/use-jquery-to-reorder-your-wp-posts-on-the-fly */
function change_amt_archive(){
/* If this is a cat archive */
if (is_category()){
$cat = get_term_by('name', single_cat_title('',false), 'category');
$archivetax ='category';
$archivetype = $cat->slug;
$catid = $cat->term_taxonomy_id;
}//if cat

if( isset($_GET['a']) && $_GET['a'] != ''){
$amt = $_GET['a'];
switch($amt){

case '10':
$amtper = '10';
break;

case '50':
$amtper = '50';
break;

case 'all':
$amtper = '-1';
break;
}}
else{ //default
$amtper = '10';
}
?>
Amount Per Page:
<select id="amt-per">
<option value="10" <?php echo (!isset($amt) || $amt == '' || $amt == '20')? 'selected="selected"':''; ?>>10</option>
<option value="50"  <?php echo ($amt == '50')?   'selected="selected"':''; ?>>50</option>
<option value="all" <?php echo ($amt == 'all')? 'selected="selected"':''; ?>>View All</option>
</select>
<script type="text/javascript">
var amtper = jQuery('#amt-per');
var str;
amtper.change(function(){
str = jQuery(this).val();
window.location.href = "<?php echo site_url(); ?>/<?php echo $archivetax ?>/<?php echo $archivetype ?>/?a="+str;
});
</script>
<?php
$args = array(
	'cat' =>  $catid,
	'posts_per_page' => $amtper
);
query_posts( $args );
?>

<?php
}//end change_amt_archive
?>


<?php /* temlate tag - paste above archive loop in archive.php template
if(function_exists('change_amt_archive')) :
change_amt_archive();
endif;
*/ ?>