Drupal - Overriding Drupal Core Javascript Files?

<?php
    define('JQUERY_UPDATE_REPLACE_PATH', drupal_get_path('theme', 'themename') .'/jslocation');
    function phptemplate_preprocess_page(&$vars) {                   
            $scripts = drupal_add_js();      
            $new_jquery = array(jquery_update_jquery_path() => $scripts['core']['misc/jquery.js']);
            $scripts['core'] = array_merge($new_jquery, $scripts['core']);
      unset($scripts['core']['misc/jquery.js']);                
            $vars['scripts'] = drupal_get_js('header', $scripts);    
 }
 
  /**
 * Return the path to the jQuery file.
 */
 function jquery_update_jquery_path() {
  $jquery_file = array('none' => 'jquery.js', 'min' => 'jquery-1.4.3.js');
  return JQUERY_UPDATE_REPLACE_PATH .'/'. $jquery_file[variable_get('jquery_update_compression_type', 'min')];
 }
?>
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