$(document).ready(function(){
    $('h1').prepend('<img src="images/arrow.gif" alt="> ">');
setTimeout('shift_header()', 10000);
    preload_header();
});

var headerpath = 'upload/header/';
var active = 0;

function shift_header() {
    if (++active >= header.length) { active = 0; }
    var b = $('#headerimg');
    b.fadeOut('slow', function() {
        b.attr('src', headerpath+header[active]);
        b.fadeIn('slow', function() {
            setTimeout('shift_header()', 10000);
        })
    });
}

function preload_header() {
    var img;
    for (var i = 0; i < header.length; i++) {
        img = new Image();
        img.src = headerpath+header[i];
    }
}