Bonsoir,
Pour supprimer l'espace, il faut que tes liens soit "collés", qu'il n'y ai pas d'espace entre chacun d'eux.
Une astuce consiste à ajouter des commentaire html, pour garder de la lisibilité :
<a href="rundown.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image6','','images/rundown_on.jpg',1)"><img src="images/rundown_off.jpg" name="Image6" width="185" height="32" border="0" id="Image6" /></a><!--
--><a href="news.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image7','','images/news_on.jpg',1)"><img src="images/news_off.jpg" name="Image7" width="119" height="32" border="0" id="Image7" /></a><!--
--><a href="home1.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image8','','images/events_on.jpg',1)"><img src="images/events_off.jpg" name="Image8" width="150" height="32" border="0" id="Image8" /></a><!--
--><a href="photos.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image9','','images/photos_on.jpg',1)"><img src="images/photos_off.jpg" name="Image9" width="153" height="32" border="0" id="Image9" /></a><!--
--><a href="videos.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image10','','images/videos_on.jpg',1)"><img src="images/videos_off.jpg" name="Image10" width="136" height="32" border="0" id="Image10" /></a><!--
--><a href="sponsors.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image13','','images/sponsors_on.jpg',1)"><img src="images/sponsors_off.jpg" name="Image13" width="188" height="32" border="0" id="Image13" /></a><!--
--><a href="Sanstitre-1.html" onmouseout="MM_swapImgRestore()" onmouseover="MM_swapImage('Image11','','images/shop_on.jpg',1)"><img src="images/shop_off.jpg" name="Image11" width="100" height="32" border="0" id="Image11" /></a>