var tab_image = new Array(6);
for (var i=0; i< tab_image.length;i++)
	tab_image[i]= new Image();
tab_image[0].src='images/escaliers/escalier.jpg';
tab_image[1].src='images/escaliers/JEAesca.jpg';
tab_image[2].src='images/escaliers/PONesca.jpg';
tab_image[3].src='images/escaliers/SCHesca.jpg';
tab_image[4].src='images/escaliers/SCHesca1.jpg';
tab_image[5].src='images/escaliers/ESCALIER CHENE LAMELLE.jpg';
var n=0;

function change() {
n= ++n;
if (n == tab_image.length) n=0;
window.document.image.src=tab_image[n].src;
}