// 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]lantk@126.com[/EMAIL] 
 * 腾讯QQ: 570389199 
 * 网站地址: [URL=http://lantk.588.net]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){ 
  alert("对象名【"+ arguments[0] +"】无效，对联无法初始化，请检查对象名称是否正确！"); 
  this.objID = null; return; 
 }else{ 
  this.objID.style.position="absolute"; 
  this.objID.style.display="block"; 
  this.objID.style.zIndex=9999; 
 } 
 if("" == this.objID.style.top){ 
  if(isNaN(this.divTop)){ 
   alert("对象垂直位置(top)参数必须为数字。"); return; 
  }else{ 
   this.objID.style.top = this.divTop+"px"; 
  } 
 } 
 if("" == this.objID.style.left && "" == this.objID.style.right){ 
  if(isNaN(this.divPlane)){ 
   alert("对象水平位置(left||right)参数必须为数字。"); 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.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; 
}