一个简单的javascript菜单(4)

//菜单条的按钮
  this.addMenuBarItem=function(ary,index){
   var item=menu.crtElement("button",menu.bar);
   item.value=ary[0];
   item.disabled=!ary;
   item.className=id+"_barItem";
   item.onmouseover=function(){
if(menu.selectedIndex==-1){
  item.className=id+"_barItemHover";
}
else{
  menu.barItems[selectedIndex].className=id+"_barItem";
  item.className=id+"_barItemDown";
  menu.showMenu(index);
}
window.status=ary;
   }
   item.onmouseout=function(){
if(menu.selectedIndex==-1)  item.className=id+"_barItem";
window.status="";
   }
   item.onclick=function(){
event.cancelBubble=true;
if(menu.selectedIndex==-1){
  item.className=id+"_barItemDown";
  menu.showMenu(index);
}
else{
  menu.hideMenu();
  item.className=id+"_barItemHover";
}
menu.execute(ary);
item.blur();
   }
   return item;
  }

//显示子菜单
  this.showMenu=function(index){
   if(menu.selectedIndex!=-1) menu.pads[selectedIndex].style.display="none";
   menu.board.style.pixelLeft=menu.barItems[index].offsetLeft+2;
   //menu.board.style.pixelHeight="";
   if(menu.pads[index].rows.length>0) menu.board.style.display="";
   else menu.board.style.display="none";
   menu.pads[index].style.display="";
   menu.selectedIndex=index;
  }