var isNS = (navigator.appName == "Netscape" && parseInt(navigator.appVersion) >= 4);
if (document.layers) div1=document.BOUM;
if (document.getElementById) div1=document.getElementById("BOUM").style; 
var objet;
var coord;
var coordb=800;
objet=new Array(div1);
coord = new Array();
coord[0]=0;
coord[1]=0;
coord[2]=0; 
//alert(document.body.clientHeight);

function reb() {
div1.visibility="visible";


if (navigator.appName=="Microsoft Internet Explorer"){
tailley = document.body.clientHeight;
taillex = document.body.clientWidth;
offsety = document.body.scrollTop;
offsetx = document.body.scrollLeft;
distScrollLeft=50;
//alert(document.body.clientHeight+"\n"+document.body.clientWidth+"\n"+document.body.scrollTop+"\n"+document.body.scrollLeft);
}else {
tailley = window.innerHeight;
taillex = window.innerWidth;
offsety = window.pageYOffset;
offsetx = window.pageXOffset;
distScrollLeft=50;
}


if (navigator.platform=="Win32"){distScrollBott=63;}else{distScrollBott=35;}

var maxi = tailley+offsety-distScrollBott;
coord[0]=taillex+offsetx-distScrollLeft;
coord[1]+=coord[2];
if (coord[1]>maxi) 
{
coord[1]=maxi;
coord[2]=-coord[2]/1.75;
}
objet[0].left=coord[0];
objet[0].top=coord[1];
coord[2]+=2;
tempo = setTimeout("reb()", 15);
}