bg = new Array(10); bg[0] = 'images/bg_a.jpg' bg[1] = 'images/bg_b.gif' bg[2] = 'images/bg_c.jpg' bg[3] = 'images/bg_d.jpg' bg[4] = 'images/bg_e.jpg' bg[5] = 'images/bg_f.gif' bg[6] = 'images/bg_g.gif' bg[7] = 'images/bg_h.gif' bg[8] = 'images/bg_i.gif' bg[9] = 'images/bg_j.gif' index = Math.floor(Math.random() * bg.length); document.write("");// Background picture