var imagenumber = 4 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "images/mergers_masthead1.jpg"
images[2] = "images/mergers_masthead2.jpg"
images[3] = "images/mergers_masthead3.jpg"
images[4] = "images/mergers_masthead4.jpg"
var mergersImage = images[rand1]