var imagenumber = 19;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;
images = new Array
images[1] = "images/headers/header1.jpg"
images[2] = "images/headers/header2.jpg"
images[3] = "images/headers/header3.jpg"
images[4] = "images/headers/header4.jpg"
images[5] = "images/headers/header5.jpg"
images[6] = "images/headers/header6.jpg"
images[7] = "images/headers/header7.jpg"
images[8] = "images/headers/header8.jpg"
images[9] = "images/headers/header9.jpg"
images[10] = "images/headers/header10.jpg"
images[11] = "images/headers/header11.jpg"
images[12] = "images/headers/header12.jpg"
images[13] = "images/headers/header13.jpg"
images[14] = "images/headers/header14.jpg"
images[15] = "images/headers/header15.jpg"
images[16] = "images/headers/header16.jpg"
images[17] = "images/headers/header17.jpg"
images[18] = "images/headers/header18.jpg"
images[19] = "images/headers/header19.jpg"
var image = images[rand1]