<!-- Hide  

var imagenumber = 4 ;  

var randomnumber = Math.random() ;  

var rand1 = Math.round( (imagenumber-1)  
* randomnumber) + 1 ;  

images = new Array

images[1] = "main-image.jpg"
images[2] = "main-image2.jpg"
images[3] = "main-image3.jpg"
images[4] = "main-image4.jpg"

var myimage = images[rand1]

// -- End Hiding -->