Drupal 6 & 7 unset Javascript from header -

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edit: question applies drupal 6 & 7, though code example drupal 6. people have provided answers useful both versions of drupal.

i'm working in drupal creating mobile theme drupal 6 website , trying remove unnecessary core , module javascript , css through preprocess_page function in template.php file. css files removed, can't seem javascript removed. here's i've got. in example, removed except the ajax scripts.

any idea i'm doing wrong?

<?php function mytheme_preprocess_page(&$vars) {     //////// remove unneccesary drupal head files mobile version     // css     $css = drupal_add_css();        // core     unset($css['all']['module']['modules/user/user.css']);     unset($css['all']['module']['modules/node/node.css']);     unset($css['all']['module']['modules/system/defaults.css']);     unset($css['all']['module']['modules/system/system.css']);     unset($css['all']['module']['modules/system/system-menus.css']);        // contributed -- automatically generate path—— easier way     $rm[] = drupal_get_path('module','filefield').'/filefield.css';     $rm[] = drupal_get_path('module','flickr').'/flickr.css';     $rm[] = drupal_get_path('module','logintoboggan').'/logintoboggan.css';     $rm[] = drupal_get_path('module','logintoboggan').'/logintoboggan.css';     $rm[] = drupal_get_path('module','fieldgroup').'/fieldgroup.css';     $rm[] = drupal_get_path('module','views').'/css/views.css';     $rm[] = drupal_get_path('module','content').'/theme/content-module.css';        // remove contribs array     foreach ($rm $key => $value) {       unset($css['all']['module'][$value]);     }     // javascript     $scripts = drupal_add_js();      unset($scripts['module']['sites/all/modules/ajax/ajax.js']);     unset($scripts['module']['sites/all/modules/ajax/jquery/jquery.a_form.packed.js']);      // recreate tempalate variables     $vars['styles'] = drupal_get_css($css);     $vars['scripts'] = drupal_get_js('header', $scripts); } ?>

eta: here way scripts print out in header:

<script type="text/javascript" src="/sites/all/modules/ajax/jquery/jquery.a_form.packed.js?p"></script> <script type="text/javascript" src="/sites/all/modules/ajax/ajax.js?p"></script>

i found potentially better solution sort of problem. tried kerri's approach since matt v says worked him, didn't want edit template.php if avoid , regardless wasn't working in environment. problem couple js files throw errors on 1 particular page. did write simple new module runs on desired page. so- created basic .info file , below .module code. worked charm me. replace "mysite_mymodule" whatever name module , replace "my-page-alias" whatever page alias you're trying effect. 

<?php /** * implements hook_js_alter(). */  function mysite_mymodule_js_alter(&$javascript) {   $alias = drupal_get_path_alias($_get['q']);   if ($alias == "my-page-alias") {     /**      * documentation did , why did it...      */     unset($javascript['sites/all/modules/dhtml_menu/dhtml_menu.js']);     unset($javascript['sites/all/modules/apachesolr_autocomplete/apachesolr_autocomplete.js']);   } }

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