var banner_display = 1;
var banner_timer;
var timer_is_on = true;
var banner_rotate_speed = 10000;

function rotate_banner(banner_num) {
	if (!timer_is_on && banner_num == "") {
		stop_rotation();
		return;
	}
	document.getElementById("bnrhref" + banner_display).style.backgroundColor = "";
	if (banner_num == "") {
		banner_num = banner_display + 1;
		if (banner_num > 3) { banner_num = 1; }
	}
	banner_display = banner_num;
	document.getElementById("banner").style.backgroundImage = "url(/images/banner" + banner_display + ".jpg)";
	document.getElementById("bnrhref" + banner_display).style.backgroundColor = "#CCC";
	if (banner_timer) { clearTimeout(banner_timer); }
	if (timer_is_on) { banner_timer = setTimeout("rotate_banner('')", banner_rotate_speed); }
}

function scroll_banner(prev) {
	var next_banner = 1;
	if (prev) {
		next_banner = banner_display - 1;
		if (next_banner < 1) { next_banner = 3; }
	} else {
		next_banner = banner_display + 1;
		if (next_banner > 3) { next_banner = 1; }
	}
	rotate_banner(next_banner);
}
function stop_rotation() {
	clearTimeout(banner_timer);
	timer_is_on = false;
}
banner_timer = setTimeout("rotate_banner(1)", banner_rotate_speed);