Le code js tu peux le trouver 
ici
ce qui est bizarre est que les slides des vignettes fonctionnent parfaitement.
Et pour les slides, voici le css
#slide-creations {
    background-image: url('images/bg3.jpg');
    background-repeat: repeat;
}
#creations div.container {
    width: 100%;
    margin: auto;
    padding-top: 180px;
    z-index: 1000;
}
#creadetailprev {
    display: block;
    width: 38px;
    height: 38px;
    background-image: url('../images/flechegaucherond.png');
    position: absolute;
    left: -40px;
    top: 268px;
}
#creadetailnext {
    display: block;
    width: 38px;
    height: 38px;
    background-image: url('../images/flechedroiterond.png');
    position: absolute;
    right: -40px;
    top: 268px;
}
#creadetails {
    height: 500px;
     width: 980px;
    background:#fff;
    position: absolute;
    left: 0;
    top:175px;
    z-index: 1000;
}
#center-slide{
	position:relative;
	width:980px;
	margin:auto;
	padding:0;
	
	}
	
	
#creadetails .close {
    position: absolute;
    top:25px;
    right: 15px;
}
#creaprev {
    display: block;
    width: 50px;
    height: 50px;
    background-image: url('../images/flechegaucherond.png');
	background-repeat:no-repeat;
    position: absolute;
    left: 10px;
    top: 425px;
}
#creanext {
    display: block;
    width: 50px;
    height: 50px;
    background-image: url('../images/flechedroiterond.png');
	background-repeat:no-repeat;
    position: absolute;
    right:10px;
    top: 425px;
}
#crealist a.crea {
    display:block;
    float:left;
    width:155px;
    height: 134px;
}
/*
#crealist a img {
    filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0.3333 0.3333 0.3333 0 0 0 0 0 1 0\'/></filter></svg>#grayscale"); /* Firefox 10+, Firefox on Android */
    /*filter: gray;
    -webkit-filter: grayscale(100%);
}
#crealist a:hover img {
    filter: none;
    -webkit-filter: grayscale(0%);
}*/
#crealist .scrollable {
    position:relative;
    overflow:hidden;
    width: 100%;
    height:544px;
}
#crealist .scrollable .group {
    width:20000em;
    position:absolute;
    height:544px;
}
#crealist .scrollable .group div.items {
    position: relative;
    float:left;
    width: 942px;
    height:544px;
}
#crealist .scrollable .group div.items div.half {
    width: 942px;
    height: 272px;
}
#creadetailslist {
    width: 850px;
    margin: auto;
}
#creadetailslist .scrollable {
    position:relative;
    overflow:hidden;
    width: 860px;
    height:545px;
}
#creadetailslist .scrollable .group {
    width:20000em;
    position:absolute;
    height:545px;
}
#creadetailslist .scrollable .group div.items {
    position: relative;
    float:left;
    width: 860px;
    height:455px;
    padding-top: 90px;
}
#creadetailslist .scrollable .group div.items div.images {
    float: left;
    width: 500px;
    height: 380px;
    position: relative;
}
#creadetailslist .scrollable .group div.items div.images div.image {
    position: absolute;
    top:0;
    left: 0;
    width: 500px;
    height: 380px;
    overflow: hidden;
    background-color: white;  
}
/*
#creadetailslist .scrollable .group div.items div.images div.image img {
    -webkit-box-shadow:  0px 0px 10px 2px rgba(0, 0, 0, 0.5);
    box-shadow:  0px 0px 10px 2px rgba(0, 0, 0, 0.5);
}
*/
#creadetailslist .gallery_prev,
#creadetailslist .gallery_next {
    display: block;
    width: 20px;
    height: 380px;
    float:left;
    background-image: url('../images/flechegauche.png');
    background-repeat: no-repeat;
    background-position: 50% 50%;
}
#creadetailslist .gallery_next {
    background-image: url('../images/flechedroite.png');
}
#creadetailslist .scrollable .group div.items div.desc {
    float: right;
    width: 300px;
    font-size: 12px;
    font-family: helveticaneuelight, helvetica;
}
#creadetailslist .scrollable .group div.items div.desc p {
    text-align: justify;
}
#creadetailslist .scrollable .group div.items div.desc h2 {
    font-size: 16px;
    font-weight: normal;
    margin-bottom: 30px;
}
Merci pour le conseil !!