function RandomImage()
{
	if (document.getElementById("body").style.backgroundImage != 'none')
	{
		var images = new Array('home_page_image_1.jpg','home_page_image_2.jpg','home_page_image_3.jpg','home_page_image_4.jpg','home_page_image_5.jpg','home_page_image_6.jpg','home_page_image_7.jpg');
		var rnd = Math.floor(Math.random()*images.length);
		document.getElementById("body").style.backgroundImage = "url('images/" + images[rnd] + "')";
	}
}

function RandomTile()
{
	var tiles = new Array('tile-register');
	var rnd = Math.floor(Math.random()*tiles.length);
	for (var i=0; i<tiles.length; i++) document.getElementById(tiles[i]).style.display = (i == rnd) ? "block" : "none";
}

window.onload = function() {
						window.setInterval('RandomTile()', 5000);
					}