// JavaScript Document
var t = 0;

function change_bg(bgnum, flag) {
document.getElementById('page').style.backgroundImage = "url('images/north_atlantic/shiptv" + bgnum + ".jpg')";
if (flag == 0) bgnum++;
else bgnum--;
if (bgnum < 1) flag = 0;
if (bgnum > 4) flag = 1;
setTimeout("change_bg("+bgnum+", "+flag+")", 500);
}

function show_pic() {
//clearTimeout(t);
document.getElementById("image").src = "images/north_atlantic/blank.gif";
num = Math.floor(Math.random()*72)+1;
img_name = 'images/north_atlantic/' + num + '.jpg';
document.getElementById("image").src = img_name;
document.getElementById('popup').style.display = "block";
//t=setTimeout("close_pic()", 4000);
}

function close_pic() {
document.getElementById('popup').style.display = "none";
}