var fadeLevel = 0;
var image_count = 1;
var next_image = image_count + 1;
var image_count_max = 8;

image_count = Math.floor(Math.random() * image_count_max) + 1;
if (image_count == image_count_max) {
    next_image = 1;
} else {
    next_image = image_count + 1;
}
document.getElementById('img' + image_count).style.visibility = 'visible';


function fade() {
    fadeLevel++;

    document.getElementById('img' + next_image).style.opacity = fadeLevel / 100.0;
    document.getElementById('img' + next_image).style.filter = "progid:DXImageTransform.Microsoft.alpha(opacity=" + fadeLevel + ")";
    document.getElementById('img' + next_image).style.visibility = 'visible';

    document.getElementById('img' + image_count).style.opacity = (100 - fadeLevel) / 100.0;
    document.getElementById('img' + image_count).style.filter = "progid:DXImageTransform.Microsoft.alpha(opacity=" + (100 - fadeLevel) + ")";

    if (fadeLevel < 100) {
        setTimeout(fade, 10);
    } else {
        fadeLevel = 0;
        document.getElementById('img' + image_count).style.visibility = 'hidden';
        image_count = next_image;
        if (image_count == image_count_max) {
            next_image = 1;
        } else {
            next_image = image_count + 1;
        }
        setTimeout(fade, 3000);
    }
}

setTimeout(fade, 3000);

function login() {
    alert("Not yet implemented");
}