/*
*;File: KM.AD.js
*;Description: KaiMo advertisement Class
*;Author: Dnawo
*;Date: 2009-07-22
*
*;e.g.
*
*;var ad = new KM.AD();
*;ad.LeftTop = new KM.ADInfo("<a href='#' target='_blank'><img src='ad.gif' border='0' /></a>",137,182);
*;ad.RightTop = new KM.ADInfo("<a href='#' target='_blank'><img src='ad.gif' border='0' /></a>",137,182);
*;ad.LeftMiddle = new KM.ADInfo("<a href='#' target='_blank'><img src='ad.gif' border='0' /></a>",137,182);
*;ad.RightMiddle = new KM.ADInfo("<a href='#' target='_blank'><img src='ad.gif' border='0' /></a>",137,182);
*;ad.LeftBottom = new KM.ADInfo("<a href='#' target='_blank'><img src='ad.gif' border='0' /></a>",137,182);
*;ad.RightBottom = new KM.ADInfo("<a href='#' target='_blank'><img src='ad.gif' border='0' /></a>",137,182);
*;ad.Start();
*/
(function(){

//Namespace
if(!window.KM)window.KM={};
if(typeof window.KM != "object")throw new Error("'window.KM' is not an object!");

//Model Class
KM.ADInfo = function(html,width,height)
{
this.Html = html || "";
this.Width = typeof width == "number" ? width : 0;
this.Height = typeof height == "number" ? height : 0;
}
KM.ADInfo.prototype.toString = function(){
return "Html:" + this.Html + "rn" +
"Width:" + this.Width + "rn" +
"Height:" + this.Height + "rn";
};

//AD Class
KM.AD = function()
{
/*private members*/

//delay time, (milliseconds)
var _delay = 50;
//object initialize
var _initialize = function(html,width,height){
var div = document.createElement("div");
div.id = "km_" + (new Date()).getTime();
div.style.position = "absolute";
div.style.backgroundColor = "#FFFFFF";
div.style.overflow = "hidden";
div.style.top = "0px";
div.style.left = "0px";
div.style.width = width + "px";
div.style.height = height + "px";
div.innerHTML = html;
try{document.getElementsByTagName("body").item(0).appendChild(div)}catch(ex){};

return div;
}
//delete the unit
var _deleteUnit = function(text){ return Math.round(("" + text).replace(/(px)$/g,""));};
//
var _me = this;

/*public members*/

this.Version = "1.0";
this.Html = "";
this.Width = 0;
this.Height = 0;

this.LeftTop = {}; //type of ADInfo
this.RightTop = {}; //type of ADInfo
this.LeftMiddle = {}; //type of ADInfo
this.RightMiddle = {}; //type of ADInfo
this.LeftBottom = {}; //type of ADInfo
this.RightBottom = {}; //type of ADInfo

this.Start = function(){
if(this.LeftTop instanceof KM.ADInfo && !this.LeftTop.Element)
this.LeftTop.Element = _initialize(this.LeftTop.Html,this.LeftTop.Width,this.LeftTop.Height);
if(this.RightTop instanceof KM.ADInfo && !this.RightTop.Element)
this.RightTop.Element = _initialize(this.RightTop.Html,this.RightTop.Width,this.RightTop.Height);
if(this.LeftMiddle instanceof KM.ADInfo && !this.LeftMiddle.Element)
this.LeftMiddle.Element = _initialize(this.LeftMiddle.Html,this.LeftMiddle.Width,this.LeftMiddle.Height);
if(this.RightMiddle instanceof KM.ADInfo && !this.RightMiddle.Element)
this.RightMiddle.Element = _initialize(this.RightMiddle.Html,this.RightMiddle.Width,this.RightMiddle.Height);
if(this.LeftBottom instanceof KM.ADInfo && !this.LeftBottom.Element)
this.LeftBottom.Element = _initialize(this.LeftBottom.Html,this.LeftBottom.Width,this.LeftBottom.Height);
if(this.RightBottom instanceof KM.ADInfo && !this.RightBottom.Element)
this.RightBottom.Element = _initialize(this.RightBottom.Html,this.RightBottom.Width,this.RightBottom.Height);

var clientWidth = document.documentElement.clientWidth;
var clientHeight = document.documentElement.clientHeight;
var scrollTop = document.documentElement.scrollTop;
var scrollLeft = document.documentElement.scrollLeft;

if(this.LeftTop.Element){
this.LeftTop.Element.style.top = _deleteUnit(scrollTop) + "px";
this.LeftTop.Element.style.left = _deleteUnit(scrollLeft) + "px";
}
if(this.RightTop.Element){
this.RightTop.Element.style.top = _deleteUnit(scrollTop) + "px";
this.RightTop.Element.style.left = _deleteUnit(scrollLeft) + _deleteUnit(clientWidth) - _deleteUnit(this.RightTop.Element.style.width) - 2 + "px";
}
if(this.LeftMiddle.Element){
this.LeftMiddle.Element.style.top = _deleteUnit(scrollTop) + _deleteUnit(clientHeight)/2 - _deleteUnit(this.LeftMiddle.Element.style.height)/2 + "px";
this.LeftMiddle.Element.style.left = _deleteUnit(scrollLeft) + "px";
}
if(this.RightMiddle.Element){
this.RightMiddle.Element.style.top = _deleteUnit(scrollTop) + _deleteUnit(clientHeight)/2 - _deleteUnit(this.RightMiddle.Element.style.height)/2 + "px";
this.RightMiddle.Element.style.left = _deleteUnit(scrollLeft) + _deleteUnit(clientWidth) - _deleteUnit(this.RightMiddle.Element.style.width) - 2 + "px";
}
if(this.LeftBottom.Element){
this.LeftBottom.Element.style.top = _deleteUnit(scrollTop) + _deleteUnit(clientHeight) - _deleteUnit(this.LeftBottom.Element.style.height) - 2 + "px";
this.LeftBottom.Element.style.left = _deleteUnit(scrollLeft) + "px";
}
if(this.RightBottom.Element){
this.RightBottom.Element.style.top = _deleteUnit(scrollTop) + _deleteUnit(clientHeight) - _deleteUnit(this.RightBottom.Element.style.height) - 2 + "px";
this.RightBottom.Element.style.left = _deleteUnit(scrollLeft) + _deleteUnit(clientWidth) - _deleteUnit(this.RightBottom.Element.style.width) - 2 + "px";
}

setTimeout(function(){_me.Start();},_delay);
};

this.Clear = function(){
if(this.LeftTop.Element)this.LeftTop.Element.parentNode.removeChild(this.LeftTop.Element);
if(this.RightTop.Element)this.RightTop.Element.parentNode.removeChild(this.RightTop.Element);
if(this.LeftMiddle.Element)this.LeftMiddle.Element.parentNode.removeChild(this.LeftMiddle.Element);
if(this.RightMiddle.Element)this.RightMiddle.Element.parentNode.removeChild(this.RightMiddle.Element);
if(this.LeftBottom.Element)this.LeftBottom.Element.parentNode.removeChild(this.LeftBottom.Element);
if(this.RightBottom.Element)this.RightBottom.Element.parentNode.removeChild(this.RightBottom.Element);
}
};
})();

暂时只支持左上、右上、左中、右中、左下、右下六个位置，通过组合可做成对联广告。

IE(6.0)、FF(2.0)、Opera(9.6)测试通过。