var imagenumber = 5 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "includes/images/mainImages/wind-power.jpg"
images[2] = "includes/images/mainImages/soy-beans.jpg"
images[3] = "includes/images/mainImages/solar-power.jpg"
images[4] = "includes/images/mainImages/corn.jpg"
images[5] = "includes/images/mainImages/water.jpg"
var image = images[rand1]