var header_index = 1;
var header_image = false;
var _header_image = new Image();
function header_swap() {
	header_image.src = _header_image.src;
	if (header_index+1 >= header_images.length) {
		header_index = 0;
	} else {
		header_index++;
	}
	_header_image = new Image();
	_header_image.src = header_images[header_index];
}
function header_in(step) {
	if (step < 10) {
		header_image.style.opacity = (step*0.1);
		header_image.style.filter = 'alpha(opacity='+(step*10)+')';
		step++;
		setTimeout('header_in('+step+');', 60);
	} else {
		setTimeout('header_out(10);', 5000);
	}
}
function header_out(step) {
	if (step > 0) {
		header_image.style.opacity = (step*0.1);
		header_image.style.filter = 'alpha(opacity='+(step*10)+')';
		step--;
		setTimeout('header_out('+step+');', 60);
	} else {
		header_swap();
	}
}
window.onload = function() {
	header_image = document.getElementById('header_image');
	if (header_image && header_images.length > 1) {
		header_image.onload = function(){
			header_in(0);
		}
		_header_image.src = header_images[header_index];
		setTimeout('header_out(10);', 5000);
	}
}