var cloud;

function cloudscroll(desc,spd,rwnd,ffwd) {
        var style = getStyleObject(desc);
        if (style)
        {
        var debut = parseFloat(style.left);
        var avance = debut+(spd);
        if(avance<rwnd){var avance=ffwd+(spd);}
        if (document.layers){style.left=avance;}else{style.left=avance+"px";}

        cloud = setTimeout(function(){cloudscroll(desc,spd,rwnd,ffwd);},20);
        }

        }
function getStyleObject(objectId) {
        // cross-browser func
        if(document.getElementById && document.getElementById(objectId)) {
        // W3C DOM
        return document.getElementById(objectId).style;}
        else if (document.all && document.all(objectId)) {
        // MSIE 4 DOM
        return document.all(objectId).style;
        } else if (document.layers && document.layers[objectId]) {
        // NN 4 DOM
        return document.layers[objectId];
        } else {
        return false;
            }
                                }
function spot(){var tests=getStyleObject("nuage1");var test=parseInt(tests.left);alert (test);}