var imagenumber = 4 ;
var randomnumber = Math.random() ;
var rand1 = Math.floor( Math.random()*imagenumber) + 1 ;
images = new Array
images[1] = "images/intro/photo_set_01.jpg"
images[2] = "images/intro/photo_set_02.jpg"
images[3] = "images/intro/photo_set_03.jpg"
images[4] = "images/intro/photo_set_04.jpg"


alts=new Array()
alts[1]=""
alts[2]=""
alts[3]=""
alts[4]=""

var image = images[rand1]