var headerImages = new Array("header/01.jpg","header/02.jpg","header/03.jpg","header/04.jpg","header/05.jpg","header/06.jpg","header/07.jpg","header/08.jpg","header/09.jpg","header/10.jpg","header/11.jpg","header/12.jpg","header/13.jpg","header/14.jpg","header/15.jpg","header/16.jpg","header/17.jpg","header/18.jpg","header/19.jpg","header/20.jpg","header/21.jpg","header/22.jpg","header/23.jpg","header/24.jpg","header/25.jpg","header/26.jpg","header/27.jpg","header/28.jpg","header/29.jpg","header/30.jpg","header/31.jpg","header/32.jpg","header/33.jpg","header/34.jpg","header/35.jpg","header/36.jpg","header/37.jpg","header/38.jpg","header/39.jpg","header/40.jpg","header/41.jpg","header/42.jpg","header/43.jpg","header/44.jpg")
function pickimage() 
{ 
var bgimage=headerImages[(Math.round(Math.random()*(headerImages.length-1)))]
document.getElementById("masthead").innerHTML = "<img src='" + bgimage + "'>";
}