var imagenumber = 5 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "images/banner/banner1.jpg"
images[2] = "images/banner/banner2.jpg"

images[3] = "images/banner/banner3.jpg"

images[4] = "images/banner/banner4.jpg"

images[5] = "images/banner/banner5.jpg"

images[6] = "images/banner/banner6.jpg"

images[7] = "images/banner/banner7.jpg"

images[8] = "images/banner/banner8.jpg"
var image = images[rand1]