var tableau_div = new Array("div1", "div2", "div3" ,"div4" ,"div5");
function changediv(balise_div, modif)
{
    if (document.all)
    {
        chaine_div = "window.document.all." + balise_div + ".style";
    } else if (document.layers) {
        chaine_div = "window.document." + balise_div;
    } else {
        return;
    }
    balise_div = eval(chaine_div);
    balise_div.visibility = modif;
}

function cachediv()
{
    for (var boucle=0; boucle < tableau_div.length; boucle++)
    {
       changediv(tableau_div[boucle],"hidden");
    }
}