function Navigation() {
	Panel.call(this);
	
	this.hidePrev = function() {
		document.getElementById('navPrevious').innerHTML = "";
		document.getElementById('navSpacer').innerHTML = "";
	}
	
	this.hideNext = function() {
		document.getElementById('navNext').innerHTML = "";
		document.getElementById('navSpacer').innerHTML = "";
	}
}