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function my_scripts_method() {
    wp_deregister_script( 'jquery' );
    wp_register_script( 'jquery', 'http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js');
    wp_enqueue_script( 'jquery' );
}    
 
add_action('wp_enqueue_scripts', 'my_scripts_method');