I take it the Notre-Dame_SL-mini.jpg is the same image with decreased size and quality?
[HTML]<A HREF="images/vue_intérieure_Notre-Dame_SL.png" target="_blank"><IMG HEIGHT=562,4 WIDTH=1041,5 SRC="images/vue_intérieure_Notre-Dame_SL-mini.jpg"></A>[/HTML]
With this it displays the smaller picture, and on click it opens the larger image in a new tab.