function initEcAd() {
 if(document.all.AdLayer1!=null&&document.all.AdLayer2!=null)
 {
   document.all.AdLayer1.style.posTop = -200;
   document.all.AdLayer1.style.visibility = 'visible'
   document.all.AdLayer2.style.posTop = -200;
   document.all.AdLayer2.style.visibility = 'visible'
   MoveLeftLayer('AdLayer1');
   MoveRightLayer('AdLayer2');
 }
}
function MoveLeftLayer(layerName) {
var x = 5;
var y = 100;// 左侧广告距离页首高度
var diff = (document.body.scrollTop + y - document.all.AdLayer1.style.posTop)*.40;
var y = document.body.scrollTop + y - diff;
eval("document.all." + layerName + ".style.posTop = parseInt(y)");
eval("document.all." + layerName + ".style.posLeft = x");
setTimeout("MoveLeftLayer('AdLayer1');", 20);
}
function MoveRightLayer(layerName) {
var x = 5;
var y = 100;// 右侧广告距离页首高度
var diff = (document.body.scrollTop + y - document.all.AdLayer2.style.posTop)*.40;
var y = document.body.scrollTop + y - diff;
eval("document.all." + layerName + ".style.posTop = y");
eval("document.all." + layerName + ".style.posRight = x");
setTimeout("MoveRightLayer('AdLayer2');", 20);
}

initEcAd()