var images=new Array(); 
images[0]="../rotate/1.jpg"; 
images[1]="../rotate/2.jpg"; 
images[2]="../rotate/3.jpg"; 
images[3]="../rotate/4.jpg";
images[4]="../rotate/5.jpg"; 
images[5]="../rotate/6.jpg";
images[6]="../rotate/7.jpg";

function randomimage() { 
var i=Math.floor(Math.random()*images.length); 
document.getElementById("random").src=images[i]; 

}