function getObject(objectId) {
    if(document.getElementById && document.getElementById(objectId)) {
	// W3C DOM
	return document.getElementById(objectId);
    } else if (document.all && document.all(objectId)) {
	// MSIE 4 DOM
	return document.all(objectId);
    } else if (document.layers && document.layers[objectId]) {
	// NN 4 DOM.. note: this won't find nested layers
	return document.layers[objectId];
    } else {
	return false;
    }
}
function overWeb(n){
	for (i = 1; i < 6; i++) {
		if(n==i){
			getObject("lm" + n).style.background= "url(images/left_nav_top0" + n + ".gif) no-repeat bottom";
			getObject("rc" + n).style.display= "block"
		}	
		else {
			getObject("lm" + i).style.background= "url(images/left_nav_top0" + i + ".gif)";
			getObject("rc" + i).style.display= "none"
		}
	}
	
}
String.prototype.format = function(){
var tmpStr = this;
var iLen = arguments.length;
for(var i=0;i<iLen;i++){
  tmpStr = tmpStr.replace(new RegExp("\\{" + i + "\\}", "g"), arguments[i]);
}
return tmpStr;
}
function chen() {
  var elements = new Array();
  for (var i = 0; i < arguments.length; i++) {
    var element = arguments[i];
    if (typeof element == 'string')
      element = document.getElementById(element);

    if (arguments.length == 1)
      return element;

    elements.push(element);
  }
  return elements;
}
function IMarquee(){
function throwError(){alert("接口未实现：" + arguments[0]);}
this.Scroll = function(){throwError("Scroll");}
this.Clone = function(){throwError("Clone");}
}
function AbstractMarquee(){
IMarquee.apply(this);
var ref = this;
var timer = null;
var container = null;
var indexs = ["ContainerID", "Delay", "Amount", "Width", "Height"];
this.Amount = 1;
this.Delay = 30;
this.Width = 0;
this.Height = 0;
this.ContainerID = "";
this.Start = function(){
  clearTimer();
  timer = setInterval(ref.Scroll, ref.Delay);
}
this.Stop = function(){
  clearTimer();
}
this.Pause = function(){
  clearTimer();
}
this.Init = function(){
  container = chen(this.ContainerID);
  if(container == null) {alert("无法找到id为{0}的对象,初始化失败。".format(this.ContainerID));return;};
  container.style.overflow = "hidden";
  if(this.Width > 0) container.style.width = this.Width + "px";
  if(this.Height > 0) container.style.height = this.Height + "px";
  this.Clone();
  this.AttachEvent();
  this.Start();
}
this.AttachEvent = function(){
  container.onmouseover = ref.Pause;
  container.onmouseout = ref.Start;
}
function clearTimer(){
  if(timer != null)clearInterval(timer);
}
function _Marquee(){
  var max = Math.min(indexs.length, arguments.length);
  for(var i=0;i<max;i++)
   this[indexs[i]] = arguments[i];
}
_Marquee.apply(this, arguments);
}
function MarqueeRight(){
AbstractMarquee.apply(this, arguments);
var ref = this;
var container = chen(this.ContainerID);
this.Clone = function(){
  container.innerHTML = '<table cellspacing="0" cellpadding="0" border="0"><tr><td>{0}</td><td>{0}</td></tr></table>'.format(container.innerHTML);
  container.scrollLeft = container.scrollWidth;
}
this.Scroll = function(){
  with(container){
   if(scrollLeft <= firstChild.rows[0].cells[0].offsetLeft) scrollLeft += firstChild.rows[0].cells[1].offsetWidth;
   else scrollLeft -= ref.Amount;
  }
}
}
var Marquee = {
Type : {
  RIGHT : function(){return new MarqueeRight(arguments[0]);}
},
newInstance : function(type, container){
  return this.Type[type.toUpperCase()].call(this, container);
}
}
var m3 = Marquee.newInstance("Right", "demo3");
m3.Init();