var a;
 a= new Array();
 //images page d'accueil
 a[0]=new Image;
 a[0].src="images/page_accueil/img1.jpg";
 a[1]=new Image;
 a[1].src="images/page_accueil/img2.jpg";
 a[2]=new Image;
 a[2].src="images/page_accueil/img3.jpg";
 a[3]=new Image;
 a[3].src="images/page_accueil/img4.jpg";
 a[4]=new Image;
 a[4].src="images/page_accueil/img5.jpg";
 a[5]=new Image;
 a[5].src="images/page_accueil/img6.jpg";
 a[6]=new Image;
 a[6].src="images/page_accueil/img7.jpg";
 a[7]=new Image;
 a[7].src="images/page_accueil/img8.jpg";
 
 //images city/main.html
 a[8]=new Image;
 a[8].src="images/main/img1.gif";
 a[9]=new Image;
 a[9].src="images/main/img2.gif";
 
function roll(img,nb) {
   eval("img.src=a["+nb+"].src");
}