var imagenumber = 4 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "2_say.gif"
images[2] = "4_say.gif"
images[3] = "5_say.gif"
images[4] = "6_say.gif"
var image = images[rand1]
document.write('<img src="../images/contact_us/' + image + '">')