function showDiv(div){
		var obj=document.getElementById(div);
		if(obj!=null){
			obj.style.display = "";
		}
	}
	function hideDiv(div){
		var obj=document.getElementById(div);
		if(obj!=null){
			obj.style.display = "none";
		}
	}
	
	var Switchor=Class.create();
	Switchor.prototype={
		currPageNum:1,
		switchDiv: function(){
			hideDiv(this.divName+this.currPageNum);
			if(this.currPageNum==1){
				this.currPageNum=2;
			}else{
				this.currPageNum=1;
			}
			showDiv(this.divName+this.currPageNum);
		},
		initialize: function(divName) {
			this.divName=divName;
		}
	};