Essaye par exemple de mettre une classe couleur à chaque image que tu veux voir en couleur.
Par exemple dans ta page references001.html remplace la ligne :
<div class="img001"> <a href="references001.html"></a></div> <div class="blank"></div>
Par :
<div class="img001"> <a [#red]class="couleur" [/#]href="references001.html"></a></div> <div class="blank"></div>
Pour ta page references002.html tu remplaceras de la même manière la ligne suivante
Il ne reste plus qu’à modifier la css ainsi :
#projectsPanel .img001 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left; border:0;background:url(images/gallerie/img001.jpg) no-repeat}
#projectsPanel .img001 a:hover,
#projectsPanel .img001 a.couleur{background:url(images/gallerie/img001.jpg) right no-repeat;}
#projectsPanel .img002 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left; border:0;background:url(images/gallerie/img002.jpg) no-repeat}
#projectsPanel .img002 a:hover,
#projectsPanel .img002 a.couleur{background:url(images/gallerie/img002.jpg) right no-repeat;}
#projectsPanel .img003 a{width:70px; height:70px; margin:0px 0px 10px 0px; padding:0px;float:left;border:0;background:url(images/gallerie/img003.jpg) no-repeat}
#projectsPanel .img003 a:hover,
#projectsPanel .img003 a.couleur{background:url(images/gallerie/img003.jpg) right no-repeat;}
#projectsPanel .img004 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img004.jpg) no-repeat}
#projectsPanel .img004 a:hover,
#projectsPanel .img004 a.couleur{background:url(images/gallerie/img004.jpg) right no-repeat}
#projectsPanel .img005 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img005.jpg) no-repeat}
#projectsPanel .img005 a:hover,
#projectsPanel .img005 a.couleur{background:url(images/gallerie/img005.jpg) right no-repeat}
#projectsPanel .img006 a{width:70px; height:70px; margin:0px 0px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img006.jpg) no-repeat}
#projectsPanel .img006 a:hover,
#projectsPanel .img006 a.couleur{background:url(images/gallerie/img006.jpg) right no-repeat}
#projectsPanel .img007 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img007.jpg) no-repeat}
#projectsPanel .img007 a:hover,
#projectsPanel .img007 a.couleur{background:url(images/gallerie/img007.jpg) right no-repeat}
#projectsPanel .img008 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img008.jpg) no-repeat}
#projectsPanel .img008 a:hover,
#projectsPanel .img008 a.couleur{background:url(images/gallerie/img008.jpg) right no-repeat}
#projectsPanel .img009 a{width:70px; height:70px; margin:0px 0px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img009.jpg) no-repeat}
#projectsPanel .img009 a:hover,
#projectsPanel .img009 a.couleur{background:url(images/gallerie/img009.jpg) right no-repeat}
#projectsPanel .img010 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img010.jpg) no-repeat}
#projectsPanel .img010 a:hover,
#projectsPanel .img010 a.couleur{background:url(images/gallerie/img010.jpg) right no-repeat}
#projectsPanel .img011 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img011.jpg) no-repeat}
#projectsPanel .img011 a:hover,
#projectsPanel .img011 a.couleur{background:url(images/gallerie/img011.jpg) right no-repeat}
#projectsPanel .img012 a{width:70px; height:70px; margin:0px 0px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img012.jpg) no-repeat}
#projectsPanel .img012 a:hover,
#projectsPanel .img012 a.couleur{background:url(images/gallerie/img012.jpg) right no-repeat}
#projectsPanel .img013 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img013.jpg) no-repeat}
#projectsPanel .img013 a:hover,
#projectsPanel .img013 a.couleur{background:url(images/gallerie/img013.jpg) right no-repeat}
#projectsPanel .img014 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img014.jpg) no-repeat}
#projectsPanel .img014 a:hover,
#projectsPanel .img014 a.couleur{background:url(images/gallerie/img014.jpg) right no-repeat}
#projectsPanel .img015 a{width:70px; height:70px; margin:0px 0px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img015.jpg) no-repeat}
#projectsPanel .img015 a:hover,
#projectsPanel .img015 a.couleur{background:url(images/gallerie/img015.jpg) right no-repeat}
#projectsPanel .img016 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img016.jpg) no-repeat}
#projectsPanel .img016 a:hover,
#projectsPanel .img016 a.couleur{background:url(images/gallerie/img016.jpg) right no-repeat}
#projectsPanel .img017 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img017.jpg) no-repeat}
#projectsPanel .img017 a:hover,
#projectsPanel .img017 a.couleur{background:url(images/gallerie/img017.jpg) right no-repeat}
#projectsPanel .img018 a{width:70px; height:70px; margin:0px 0px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img018.jpg) no-repeat}
#projectsPanel .img018 a:hover,
#projectsPanel .img018 a.couleur{background:url(images/gallerie/img018.jpg) right no-repeat}
#projectsPanel .img019 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img019.jpg) no-repeat}
#projectsPanel .img019 a:hover,
#projectsPanel .img019 a.couleur{background:url(images/gallerie/img019.jpg) right no-repeat}
#projectsPanel .img020 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img020.jpg) no-repeat}
#projectsPanel .img020 a:hover,
#projectsPanel .img020 a.couleur{background:url(images/gallerie/img020.jpg) right no-repeat}
#projectsPanel .img021 a{width:70px; height:70px; margin:0px 0px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img021.jpg) no-repeat}
#projectsPanel .img021 a:hover,
#projectsPanel .img021 a.couleur{background:url(images/gallerie/img021.jpg) right no-repeat}
#projectsPanel .img022 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img022.jpg) no-repeat}
#projectsPanel .img022 a:hover,
#projectsPanel .img022 a.couleur{background:url(images/gallerie/img022.jpg) right no-repeat}
#projectsPanel .img023 a{width:70px; height:70px; margin:0px 10px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img023.jpg) no-repeat}
#projectsPanel .img023 a:hover,
#projectsPanel .img023 a.couleur{background:url(images/gallerie/img023.jpg) right no-repeat}
#projectsPanel .img024 a{width:70px; height:70px; margin:0px 0px 10px 0px; padding:0px; float:left;border:0;background:url(images/gallerie/img024.jpg) no-repeat}
#projectsPanel .img024 a:hover,
#projectsPanel .img024 a.couleur{background:url(images/gallerie/img024.jpg) right no-repeat}