function scrollDoor(){
}
scrollDoor.prototype = {
sd : function(menus,divs,openClass,closeClass){
	var _this = this;
	if(menus.length != divs.length)
	{
		alert("菜单栏数目不一致！");
		return false;
	}				
	for(var i = 0 ; i < menus.length ; i++)
	{	
		_this.$(menus[i]).value = i;				
		_this.$(menus[i]).onmouseover = function(){
					
			for(var j = 0 ; j < menus.length ; j++)
			{						
				_this.$(menus[j]).className = closeClass;
				_this.$(divs[j]).style.display = "none";
			}
			_this.$(menus[this.value]).className = openClass;	
			_this.$(divs[this.value]).style.display = "block";				
		}
	}
 },
$ : function(oid){
	if(typeof(oid) == "string")
	return document.getElementById(oid);
	return oid;
}
}