function scrollDoor(){
}
scrollDoor.prototype = {
	sd : function(menus,divs,openClass,closeClass){
	var _this = this;
	if(menus.length != divs.length){
		alert("菜单层数量和内容层数量不一样!");
		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;
	}
}