var imagenumber = 21 ;
var randomnumber = Math.random() ;
var rand1 = Math.round( (imagenumber-1) * randomnumber) + 1 ;

images = new Array
images[1] = '/ui/images/header/h00.jpg'
images[2] = '/ui/images/header/h01.jpg'
images[3] = '/ui/images/header/h02.jpg'
images[4] = '/ui/images/header/h03.jpg'
images[5] = '/ui/images/header/h04.jpg'
images[6] = '/ui/images/header/h05.jpg'
images[7] = '/ui/images/header/h06.jpg'
images[8] = '/ui/images/header/h07.jpg'
images[9] = '/ui/images/header/h08.jpg'
images[10] = '/ui/images/header/h09.jpg'
images[11] = '/ui/images/header/h10.jpg'
images[12] = '/ui/images/header/h11.jpg'
images[13] = '/ui/images/header/h12.jpg'
images[14] = '/ui/images/header/h13.jpg'
images[15] = '/ui/images/header/h14.jpg'
images[16] = '/ui/images/header/h15.jpg'
images[17] = '/ui/images/header/h16.jpg'
images[18] = '/ui/images/header/h17.jpg'
images[19] = '/ui/images/header/h18.jpg'
images[20] = '/ui/images/header/h19.jpg'
images[21] = '/ui/images/header/h20.jpg'

var image = images[rand1]
document.write("<img src='" +image+ "' alt='Offroad Club Iasi'>")