Changing a menu's target nodes for each page
I found an answer to my question: the best is to use a programmatic approach by using the l() function that is available anywhere within a Drupal installation. It accepts three arguments:


$text: The text that will be visible to users for your link
$path: The URL that the link will go to when clicked.
$options: An associative array which allows to set additional parameters to further customize the link with CSS classes etc…


A good introduction is found here: http://www.pixelclever.com/how-and-why-use-l-function-create-links-drupal-programming.
This function can be used in the template files, or directly from a node body.