var seconds = 2; 
var numberPhotos = 5;
var lastPhotoId = 0;
var photoId = 0;

function showObject(strObjectId)
{
	document.getElementById(strObjectId).style.display = '';
}
function hideObject(strObjectId)
{
	document.getElementById(strObjectId).style.display = 'none';
}
function body_onLoad()
{
	photoRotate();
}
function photoRotate()
{
    lastPhotoId = photoId;
    if (photoId == numberPhotos) 
    {
        photoId = 0;
    }
    photoId = photoId + 1;
    if (lastPhotoId != 0)
    {
        showObject('home' + photoId);
        hideObject('home' + lastPhotoId);
    }
    setTimeout("photoRotate(" + photoId + ")", seconds * 1000); 
}
function photoRotateNext()
{
    lastPhotoId = photoId;
    if (photoId == numberPhotos) 
    {
        photoId = 0;
    }
    photoId = photoId + 1;
    if (lastPhotoId != 0)
    {
        showObject('home' + photoId);
        hideObject('home' + lastPhotoId);
    }
}