function initEcAd() {
    document.all.divLeft.style.posTop = -200;
    document.all.divLeft.style.visibility = 'visible'
    document.all.divRight.style.posTop = -200;
    document.all.divRight.style.visibility = 'visible'
    MoveLeftLayer('divLeft',50);
    MoveRightLayer('divRight',50);
}
function MoveLeftLayer(layerName,y_obj) {
    var x = 20;
    var y = y_obj;// 左侧广告距离页首高度
    var diff = (document.body.scrollTop + y - eval("document.all."+layerName+".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('"+layerName+"',"+y_obj+");", 20);
}
function MoveRightLayer(layerName,y_obj) {
    var x = 20;
    var y = y_obj;// 右侧广告距离页首高度
    var diff = (document.body.scrollTop + y - eval("document.all."+layerName+".style.posTop"))*.40;
    var y = document.body.scrollTop + y - diff;
    eval("document.all." + layerName + ".style.posTop = parseInt(y)");
    eval("document.all." + layerName + ".style.posRight = x");
    setTimeout("MoveRightLayer('"+layerName+"',"+y_obj+");", 20);
}

var adLeftHtml ="<iframe style='WIDTH: 170px; HEIGHT: 300px' id='a' frameBorder='no' scrolling='no' src='http://www.mzwu.com/' align='top'></iframe>";
var adRightHtml = "<iframe style='WIDTH: 170px; HEIGHT: 300px' id='aa' frameBorder='no' scrolling='no' src='http://www.mzwu.com/' align='top'></iframe>";
var divLeft = "<div id='divLeft' style='position: absolute;visibility:hidden;z-index:1'>"+adLeftHtml+"</div>";
var divRight = "<div id='divRight' style='position: absolute;visibility:hidden;z-index:1'>"+adRightHtml+"</div>";
document.write(divLeft + divRight);

initEcAd()