<!--
    if (document.images){var icone=new Image; icone.src="img/flech_up.gif";}

    var reset = 'javascript:window.scrollTo(0,0)'

    var ns = document.getElementById && !document.all
    var ie = document.getElementById &&  document.all

    document.write('<span id="fleche" style="position:absolute;width:21;height:21"><\/span>')
    
    function on_scroll(){
    var w_ns = ns?  pageXOffset + w  :  document.body.scrollLeft + w
    var h_ns = ns?  pageYOffset + h  :  document.body.scrollTop  + h -18;
    top_fleche.style.left =   28;      // w_ns
    top_fleche.style.top  =   h_ns -20;
    cache();
    }

    function showFleche()  { document.body.scrollTop += 1; document.body.scrollTop -= 1; }

    function on_onload(){

    top_fleche = document.getElementById("fleche")
    top_fleche.innerHTML='<a href="'+reset+'"><img src="img/flech_up.gif" border="0px" alt="&nbsp;top&nbsp;"><\/a>'
     w = ns?    window.innerWidth  - top_fleche.offsetWidth  - 8  :  document.body.clientWidth  - top_fleche.offsetWidth  - 24
     h = ns?    window.innerHeight - top_fleche.offsetHeight - 8  :  document.body.clientHeight - top_fleche.offsetHeight + 30
    top_fleche.style.left =   12   // w
    top_fleche.style.top  =   h

         if (ie) window.onscroll = on_scroll;
    else if (ns)           start = setInterval("on_scroll()",20);
    cache();
    showFleche();
    }

    window.onload   = on_onload;
    window.onresize = new Function("window.location.reload()")


    function cache(){
    var scroll_H = 0
          if (typeof( window.pageYOffset) == 'number')                          {scroll_H = window.pageYOffset}
    else {if (document.body && (document.body.scrollTop))                       {scroll_H = document.body.scrollTop}
    else {if (document.documentElement && (document.documentElement.scrollTop)) {scroll_H = document.documentElement.scrollTop}}
    }
    if (scroll_H >= 32) {document.getElementById("fleche").style.visibility="visible"}
    if (scroll_H <  32) {document.getElementById("fleche").style.visibility="hidden"}
    }

// -->

