function ToggleBubble(i)
{
	var bubble_description = document.getElementById("bubble_description_" + i);
	var bubble_img = document.getElementById("bubble_img_" + i);
	
	if (bubble_description.style.display == "block") {
		bubble_img.src = '/images/plus.gif';
		bubble_description.style.display = "none";
	} else {
		bubble_img.src = '/images/transparent.gif';
		bubble_description.style.display = "block";
	}
}