Change menu links so they work with one page scrolling website

index.php

<?php if( !is_front_page() ) { ?>
  <script>
    //Change links so they work if it is not the homepage
    var j = jQuery.noConflict();
    j(function() {
        j('#menu-primary-menu li a').each(function() {
            var href = j(this).attr('href'),
            siteUrl = window.location.protocol + '//' + window.location.host + '/';
            
            if (document.location.href.indexOf(href) === -1) { 
                j(this).attr('href', siteUrl + href);
            }
            
        });
    });
  </script>
<?php } ?>