simg=new Array(11);
simg[0]="random_image4/001.jpg";
simg[1]="random_image4/002.jpg";
simg[2]="random_image4/003.jpg";
simg[3]="random_image4/004.jpg";
simg[4]="random_image4/005.jpg";
simg[5]="random_image4/006.jpg";
simg[6]="random_image4/007.jpg";
simg[7]="random_image4/008.jpg";
simg[8]="random_image4/009.jpg";
simg[9]="random_image4/010.jpg";
simg[10]="random_image4/011.jpg";
Myimg=Math.floor(11*Math.random());
document.write("<center><img src='"+simg[Myimg]+"'><\/center>");