var screen_width=screen.width-4;

function resize()
{
var width_client="";
if (document.all)
{
width_client=document.body.clientWidth;
var max_engine_down = width_client - 19 * 110;
if(width_client = screen_width && document.getElementById("valeur").value <= max_engine_down)
{
document.getElementById("menu_principal").style.left=max_engine_down;
}
}
else
{
width_client=window.innerWidth;
var max_engine_down = width_client - 19 * 110;
if(width_client = screen_width && document.getElementById("valeur").value <= max_engine_down)
{
document.getElementById("menu_principal").style.left=max_engine_down;
}
}
}

var timer=0;
var x=0;
 
function init_timer(){timer=1;}
function stop_timer(){timer=0;}
 
function avance_gauche(){
document.getElementById("menu_principal").style.left=x;
var stop_engine=0;
var engine=x;
if(timer==1){
setTimeout("avance_gauche()",40);
if(engine>=0){x+=0;}else{x+=8;}
document.getElementById("valeur").value=engine;
}
}

function avance_droite(){
document.getElementById("menu_principal").style.left=x;

var stop_engine=0;
var engine=x;

var width_client="";
if (document.all)
{
width_client=document.body.clientWidth;
}
else
{
width_client=window.innerWidth;
}

var max_engine_down = width_client - 19 * 110 + 8;
if(timer==1 && document.getElementById("menu_principal").style.left){
setTimeout("avance_droite()",40);
if(engine<=max_engine_down){x+=0;}else{x+=-8;}
document.getElementById("valeur").value=engine;
}
}

function go(adresse){
window.location.href=adresse; 
}