function objStageSimple(){
	this.arrLayers = new Array();
	
	this.addLayer = function (strLayerId){
		this.arrLayers[this.arrLayers.length] = strLayerId;
		document.getElementById(strLayerId).style.display = 'none'
	}

	this.show =  function (){
		this.hideall();
		for (var i=0;i < arguments.length; i++){
			document.getElementById(arguments[i]).style.display = 'block'
		}
	}

	this.hideall = function (){
		for (i=0;i<this.arrLayers.length;i++){
			document.getElementById(this.arrLayers[i]).style.display = 'block'
			document.getElementById(this.arrLayers[i]).style.display = 'none'
		}
	}

}