function Toggle(ob) {
	if (document.getElementById) {
		currentVisibility = document.getElementById(ob).className;
	} else if (document.all) {
		currentVisibility = document.all.ob.className;
	} else {
		currentVisibility = document.ob.className;
	}
	if (currentVisibility == "visible") { Hide(ob); }
	else { Show(ob); }
}

function TogglePlusMinus(id,plus,minus) {
	if (document.getElementById) {
		img = document.getElementById(id);
		if (img.alt == '+') { img.alt = '-'; img.src = minus; }
		else if (img.alt == '-') { img.alt = '+'; img.src = plus; }		
	}
}

function Show(ob) {
	if (document.getElementById) {
		document.getElementById(ob).className = "visible";
	} else if (document.all) {
		document.all.ob.className = "visible";
	} else {
		document.ob.className = "visible";
	}
}

function Hide(ob) {
	if (document.getElementById) {
		document.getElementById(ob).className = "invisible";
	} else if (document.all) {
		document.all.ob.className = "invisible";
	} else {
		document.ob.className = "invisible";
	}
}

function changeImage(id,url) {
	if (document.getElementById) {
		document.getElementById(id).src = url;
	}
}