function menuswitch(classname){		
		this._elements = [];
		this._default = -1;
		this._classname = classname;
		this._previous = false;
	}
	menuswitch.prototype.setdefault = function(id){
		this._default = number(id);
	}
	menuswitch.prototype.setprevious = function(flag){
		this._previous = boolean(flag);
	}
	menuswitch.prototype.collectelementbyclass = function(){
		this._elements = [];
		var allelements = document.getelementsbytagname("div");
		for(var i=0;i<allelements.length;i++){
			var mitem = allelements[i];
			if (typeof mitem.classname == "string" && mitem.classname == this._classname){
				var h3s = mitem.getelementsbytagname("h3");
				var uls = mitem.getelementsbytagname("ul");
				if(h3s.length == 1 && uls.length == 1){
					h3s[0].style.cursor = "hand";					
					if(this._default == this._elements.length){
						uls[0].style.display = "block";	
					}else{
						uls[0].style.display = "none";	
					}
					this._elements[this._elements.length] = mitem;
				}				
			}
		}
	}
	menuswitch.prototype.open = function(melement){
		var uls = melement.getelementsbytagname("ul");
		uls[0].style.display = "block";
	}
	menuswitch.prototype.close = function(melement){
		var uls = melement.getelementsbytagname("ul");
		uls[0].style.display = "none";
	}
	menuswitch.prototype.isopen = function(melement){
		var uls = melement.getelementsbytagname("ul");		
		return uls[0].style.display == "block";
	}
	menuswitch.prototype.toggledisplay = function(header){
		var mitem;
		if(window.addeventlistener){
			mitem = header.parentnode;
		}else{
			mitem = header.parentelement;
		}
		if(this.isopen(mitem)){
			this.close(mitem);
		}else{
			this.open(mitem);
		}		
		if(!this._previous){
			for(var i=0;i<this._elements.length;i++){
				if(this._elements[i] != mitem){				
					var uls = this._elements[i].getelementsbytagname("ul");
					uls[0].style.display = "none";		
				}
			}
		}
	}	
	menuswitch.prototype.init = function(){		
		var instance = this;
		this.collectelementbyclass();
		if(this._elements.length==0){
			return;
		}
		for(var i=0;i<this._elements.length;i++){
			var h3s = this._elements[i].getelementsbytagname("h3");			
			if(window.addeventlistener){
				h3s[0].addeventlistener("click",function(){instance.toggledisplay(this);},false);
			}else{
				h3s[0].onclick = function(){instance.toggledisplay(this);}
			}
		}
	}