function preload_images(prefix,debut,fin,ext){
    var i;
    var tTab = new Array();
    for(i=debut; i<=fin; i++){
        tTab[i] = new Image();
		tTab[i].src = prefix + i +"_moy."+ ext;
    }
}

function decrire(source, texte){
    document.getElementById("H3_desc").innerHTML = texte;
    document.getElementById("IMG_max").src = source.substring(0,source.lastIndexOf("_")+1)+"moy.jpg";
    document.getElementById("A_max").href = source.substring(0,source.lastIndexOf("_")+1)+"max.jpg";
    document.getElementById("A_max").title = texte;
}