var DisplayManager = {
	selected: null,
	
	select: function(layer) {
		this.selected = layer;
	},
	
	changeView: function(layer) {
		this.hideElement(this.selected);
		this.showElement(layer);
		this.selected = layer;
	
		if(layer == 'p1Div') {
			$('s5').src = Preloader.preloadArray[5].src;
			$('s6').src = Preloader.preloadArray[6].src;
		} else {
			$('s5').src = Preloader.preloadonArray[5].src;
			$('s6').src = Preloader.preloadonArray[6].src;
		}
	},
	
	setBlankLayer: function () {
		if(this.selected != null) this.hideElement(this.selected);
		this.selected = null;
	},
	
	changeLayer: function(layer) {
		if(this.selected != null) this.hideElement(this.selected);
		this.showElement(layer);
		this.selected = layer;
	},
	
	hideElement: function(id) {
		var obj=$(id);
		if(obj != null) obj.style.display='none';
	},

	showElement: function(id) {
		var obj=$(id);
		if (obj != null) obj.style.display='block';
	}
}