function initEcAd(LName,RName) { 
document.all.NowAd_left.style.posTop = -200; 
document.all.NowAd_left.style.visibility = 'visible'; 
document.all.NowAd_left.style.position = 'absolute'; 
document.all.NowAd_right.style.posTop = -200; 
document.all.NowAd_right.style.visibility = 'visible'; 
document.all.NowAd_right.style.position = 'absolute'; 
MoveLeftLayer(LName); 
MoveRightLayer(RName); 
} 
function MoveLeftLayer(LName) { 
var x = 5; 
var y = 165; 
LeftName=LName; 
eval("var diff = (document.body.scrollTop + y - document.all." + LeftName + ".style.posTop)*.40"); 
var y = document.body.scrollTop + y - diff; 
eval("document.all." + LeftName + ".style.posTop = y"); 
eval("document.all." + LeftName + ".style.posLeft = x"); 
setTimeout("MoveLeftLayer(LeftName);", 20); 
} 
function MoveRightLayer(RName) { 
var x = 5; 
var y = 165; 
RightName=RName; 
eval("var diff = (document.body.scrollTop + y - document.all." + RightName + ".style.posTop)*.40"); 
var y = document.body.scrollTop + y - diff; 
eval("document.all." + RightName + ".style.posTop = y"); 
eval("document.all." + RightName + ".style.posRight = x"); 
setTimeout("MoveRightLayer(RightName);", 20); 
} 
document.write("<span id=NowAd_left><!--a href='http://www.jyzyj.com.cn/s43.html' target='_blank'><img src='http://www.jyzyj.com.cn/upload/piao1.jpg' WIDTH=100 HEIGHT=160 border=0 title=家用制氧机></img></a-->&nbsp</span>" 
 + "<span id=NowAd_right><a href='http://www.jyzyj.com.cn/s43.html' target='blank'><img src='http://www.jyzyj.com.cn/upload/piao2.jpg' WIDTH=100 HEIGHT=160 border=0 title=家用制氧机></img></a></span>"); 

initEcAd("NowAd_left","NowAd_right")