var images = new Array();

images[0] = "images/banners/menu-salads/00.jpg";  
images[1] = "images/banners/menu-salads/01.jpg";  
images[2] = "images/banners/menu-salads/02.jpg";
images[3] = "images/banners/menu-salads/01.jpg";
images[4] = "images/banners/menu-sandwiches/00.jpg";  
images[5] = "images/banners/menu-sandwiches/01.jpg";  
images[6] = "images/banners/menu-sandwiches/02.jpg";
images[7] = "images/banners/menu-sandwiches/01.jpg";

function ShowImg() {
var number = images.length;
var increment = Math.floor(Math.random() * number);
document.write('<img src="' + images[increment] + '" alt="Image from Suzanne\'s Cuisine" width="460" height="150" id="mainImageMessage" />');
}

var rotate = 5000; 
var count = 0;

function RotateImg(myImage){
 myImage.src=images[count];
 count++;
 if(count==images.length){count = 0;}
 setTimeout("RotateImg(myImage)",rotate);
}