function montre(id) {
    var d = document.getElementById(id);
    for (var i = 1; i<=10; i++) {
        if (document.getElementById('slogin'+i)) {document.getElementById('slogin'+i).style.display='none';}
    }
    if (d) {d.style.display='block';}
}

function preloader(){
    AllImages=new Array("images/nav_btm/bn_login_on.gif", "images/nav_btm/bn_contacto_on.gif", "images/nav_btm/bn_inicio_on.gif", "images/nav_btm/bn_mapa_on.gif");
    for(loadall=0; loadall<AllImages.length; loadall++){
        var LoadedImage=new Image();
        LoadedImage.src=AllImages[loadall];
    }
}


function roll(img_name, img_src){
   document[img_name].src = img_src;
}