var StMenu = function(){
 	var self = this;
 	this._lables = [];
 	this._lable_obj_list = [];
 	this._contents = [];
 	this._content_obj_list = [];
 	
 	this.g = function(id){
 		return document.getElementById(id);
 	};
 	// 增加菜单项
 	this.addMenu = function(lable_id,content_id){
 		var lable_obj = this.g(lable_id);
 		var content_obj = this.g(content_id);
 		if( lable_obj&&content_obj ){
 			this._lables[this._lables.length] = lable_id;
 			this._lable_obj_list[this._lable_obj_list.length] = lable_obj;
 			this._contents[this._contents.length] = content_id;
 			this._content_obj_list[this._content_obj_list.length] = content_obj;
 			this.bindLableEvent(lable_obj);
 			this.bindContentEvent(content_obj);
 		}
 	};
 	
 	// 绑定事件
 	this.bindLableEvent = function(lable_obj){
 		lable_obj.onmouseover = function(){
 			self.hideAllContent();
 			self.showLable(this.id);
 		}
 	};
 	// 绑定事件
 	this.bindContentEvent = function(content_obj){
 		content_obj.onmouseout = function(){
 			
 		}
 	}
 	
 	// 显示某个标签对应的区域
 	this.showLable = function(lable_id){
 		var index = -1;
 		var i = 0;
 		for(i=0;i<this._lables.length;i++ ){
 			if( this._lables[i]==lable_id ){
 				index = i;
 				break;
 			}
 		}
 		if( index>-1 ){
 			this._content_obj_list[index].style.display = '';
 		}
 	}
 	
 	// 隐藏所有内容区域
 	this.hideAllContent = function(){
 		for(var i=0;i<this._content_obj_list.length;i++){
 			this._content_obj_list[i].style.display = 'none';
 		}
 	}
 }