<!-- Hide from old browsers

var imagenumber = 9 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "http://www.styrene.org/i/improves_tractor.jpg"
images[2] = "http://www.styrene.org/i/improves_tank.jpg"
images[3] = "http://www.styrene.org/i/improves_turbine.jpg"
images[4] = "http://www.styrene.org/i/improves_stack1.jpg"
images[5] = "http://www.styrene.org/i/improves_stack2.jpg"
images[6] = "http://www.styrene.org/i/improves_helmet.jpg"
images[7] = "http://www.styrene.org/i/improves_manway.jpg"
images[8] = "http://www.styrene.org/i/improves_eggs.jpg"
images[9] = "http://www.styrene.org/i/improves_gaming.jpg"
var image = images[rand1]
// -- End Hiding Here -->