Linking

I’ve made another page (links.php) which is a bit of a replica of my index-.php. It’s used for displaying my links (duh), entered in WP, as well as my BlogRoll. The problem is I use search-engine-friendly-URI’s, and therefor I cannot link back to my index-page using a relative nor a absolute URI. Confused ? You won’t be, after you visit my site https://www.7seconden.be (warning: this site is in Dutch!) and click on the links-link (top left). How can I resolve this?

Excuse me !!!: I’m only experiencing this problem when used reading a post (using the permalink option).