function montre_apercu(image)
{
if(image=="")
document.getElementById("div_apercu").innerHTML="<img src='http://www.zenith-orleans.fr/wp-content/themes/dancefloor/images/plan/zenith-orleans-plan-salle-plan-defaut.jpg' alt='' />";
else
document.getElementById("div_apercu").innerHTML="<img alt='' src='http://www.zenith-orleans.fr/wp-content/themes/dancefloor/images/plan/"+image+"' />";
}