c_product_detail = function(){

  var menu = new Array('label','accessory','url','download');

  this.resetMenus = function(){
    for(var i=0; i < menu.length; i++){
      document.getElementById("tab_"+menu[i]).className = "inactive";
      document.getElementById("mn_"+menu[i]).className = "hidden";
    }  
  }
  
  this.switchTab = function(label){
    this.resetMenus();
    document.getElementById("tab_"+label).className = "active";
    document.getElementById("mn_"+label).className = "block";
  }
  
}

product_detail = new c_product_detail();