function ToggleMenu(i) {
	var thisItem = document.getElementById(i);
	if (window.opera){
		var Visibility = thisItem.style.visibility
		thisItem.style.visibility = (Visibility == "hidden") ? "visible" : "hidden";
		document.getElementById("square" + i).src = (Visibility == "hidden") ? "images/minus.gif" : "images/plus.gif";
	}
	else{
		var Display = thisItem.style.display;
		thisItem.style.display = (Display == "none") ? "block" : "none";
		document.getElementById("square" + i).src = (Display == "none") ? "images/minus.gif" : "images/plus.gif";
	}
}