var backgroundSrcs = new Array("images/group_formal.jpg","images/b_d_wedding.jpg","images/s_t_wedding.jpg","images/c_c_wedding.jpg","images/choir_robes.jpg")
function pickimage()
{
var bgimage=backgroundSrcs[(Math.round(Math.random()*(backgroundSrcs.length-1)))]
document.getElementById("header").style.backgroundImage = "url('" + bgimage + "')";
}