// JavaScript Document

/* ======================================================
* 程序名: Maple Web.CMS (平滑对联广告)
* 当前版本: v1.0.0 beta
* 作者: 云端o枫o0
* 联系邮件: [email]lantk@126.com[/email]
* 腾讯QQ: 570389199
* 网站地址: [url]http://lantk.588.net[/url]
* 最后更新: 2007-11-10
* 注释: 此段代码不会影响程序执行，请尊重作者的劳动，谢谢。
* =======================================================
*/
function couplet(){
    if(arguments.length>=1)    this.objID = document.getElementById(arguments[0]);
    if(arguments.length>=2)    this.divTop = arguments[1];
    if(arguments.length>=3) this.divPlane = arguments[2];
    if(arguments.length>=4)    this.scrollDelay = arguments[4];
    if(arguments.length>=5) this.waitTime = arguments[5];
    if(!this.objID){
    
        this.objID = null; return;
    }else{
        this.objID.style.position="absolute";
       
        this.objID.style.zIndex=9999;
    }
    if("" == this.objID.style.top){
        if(isNaN(this.divTop)){
        return;
        }else{
            this.objID.style.top = this.divTop+"px";
        }
    }
    if("" == this.objID.style.left && "" == this.objID.style.right){
        if(isNaN(this.divPlane)){
         return;
        }
        if(this.divPlane>0) this.objID.style.left = this.divPlane+"px";
        if(this.divPlane<0) this.objID.style.right = Math.abs(this.divPlane)+"px";
    }
    if(this.scrollDelay<15 || isNaN(this.scrollDelay)) this.scrollDelay = 15;
    if(this.waitTime<500 || isNaN(this.waitTime)) this.waitTime = 500;
    if(arguments.length>=1) this.start();
}
couplet.prototype.start = function(){

    if(null == this.objID) return;
    var objCouplet = this;
    timer = this.scrollDelay;
    objCouplet.lastScrollY = 0;
    objCouplet.timerID = null;
    objCouplet.objID.style.display="block";
    objCouplet.startID = function(){
        if("block" == objCouplet.objID.style.display){
            objCouplet.run();
        }else{
            clearInterval(objCouplet.timerID);
        }
    }
    objCouplet.Begin = function(){
        objCouplet.timerID = setInterval(objCouplet.startID,timer);
    }
    
    setTimeout(objCouplet.Begin,this.waitTime);
}
couplet.prototype.run = function(){
    if(document.documentElement && document.documentElement.scrollTop){
        uu_scrY = parseFloat(document.documentElement.scrollTop);
    }else if(document.body){
        uu_scrY = parseFloat(document.body.scrollTop);
    }
    uu_divX = parseFloat(this.objID.style.top.replace("px",""));
    uu_curTop = .1 * (uu_scrY - this.lastScrollY);
    uu_curTop = uu_curTop>0?Math.ceil(uu_curTop):Math.floor(uu_curTop);
    this.objID.style.top = parseFloat(uu_divX + uu_curTop) + "px";
    this.lastScrollY += uu_curTop; 
}