yeah, .htaccess code is often a better substitute because it means you don't have to alter any of your other pages.
for future reference here is how to do this with .htaccess: (put this in your .htaccess file in the main folder)
Code:
Options +FollowSymLinks
RewriteEngine on
RewriteRule index.php$ index.php?pagename=portfolio8ds.html&css=style.css