/* Auteur : Alexielle avec aide de Maxhysteria */
function choixbackground()
	{
if (screen.width <= 800) {
url_image = 'images/image800.jpg';
	affiche = 'url('+url_image+')'; 
}
else if (screen.width <= 1024) { 
              url_image = 'images/image1024.jpg';
	affiche = 'url('+url_image+')'; 
	} 
else if (screen.width <= 1280) {
url_image = 'images/image1280.jpg';
	affiche = 'url('+url_image+')'; 
}
else 
 {
url_image = 'images/imagesup.jpg';
	affiche = 'url('+url_image+')'; 
}
document.body.style.backgroundImage=affiche;

}