.intro {float : right;width :590px;   }

/*** set the width and height to match your images **/

#slideshow {
    position:relative;
    width:500px;
    height:500px;
}

#slideshow IMG {
    position:absolute;
    top:0;
    left:0;
    z-index:8;
    opacity:0.0;
}

#slideshow IMG.active {
    z-index:10;
    opacity:1.0;
}

#slideshow IMG.last-active {
    z-index:9;
}

/*** pour le reste **/

#col_article { float :right; margin-top : 10px; }
#col_article img{ border :1px solid black; }
#col_article img.pdf{ margin-top : 10px;border :1px solid black; }