/*#img_box {
    position: fixed;
    top:-15px;
    width: 100%;
    height: 1000px;
    z-index: -1000;
}

#img_box img{
	width: 100%;
	min-height: 100%;
}*/

#cover {
    width: 940px;
    max-width: 940px;
    height: 350px;
    overflow-x: hidden;
    margin: 0px;
    padding:0px;
    background:url("../../../images/background/presentation.jpg") no-repeat top center fixed;
    z-index: -100;
   -webkit-background-size: cover; /* pour anciens Chrome et Safari */
   background-size: cover; /* version standardisée*/
   /*position: fixed;*/
   
}

#cover .bg-cover {
    margin: 0px;
    padding:0px;
    background:url("../../../images/background/opacity_20.png") top center fixed;
    right: 0px;
    left: 0px;
    bottom: 0px;
    top:0px;
    z-index: 1000;
    width: 100%;
    max-width: 100%;
    overflow-x: hidden;
    height: 1300px;
    -webkit-background-size: cover; /* pour anciens Chrome et Safari */
   background-size: cover; /* version standardisée*/
   position: fixed;overflow-y: hidden;
  }