www.gusucode.com > 中网景企业网站管理系统 2008源码程序 > common/imboard.js

    /*IM board*/
lastScrollY=0; 
function heartBeat(){ 
var scrollPos; 
if (typeof window.pageYOffset != 'undefined') { 
   scrollPos = window.pageYOffset; 
} 
else if (typeof document.compatMode != 'undefined' && 
     document.compatMode != 'BackCompat') { 
   scrollPos = document.documentElement.scrollTop+150; //+150-Asean
} 
else if (typeof document.body != 'undefined') { 
   scrollPos = document.body.scrollTop+150;  //+150-Asean
} 

diffY=scrollPos;
percent=.1*(diffY-lastScrollY); 
if(percent>0)percent=Math.ceil(percent); 
else percent=Math.floor(percent); 
document.all.im_r.style.pixelTop+=percent; 
lastScrollY=lastScrollY+percent; 
} 
window.setInterval("heartBeat()",1);