function initEcAd() {
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 = 0;
var y = 10;// 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 = 10;
var y = 10;// 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);
}
function closeid(){ 
document.getElementById("AdLayer1").style.display="none"; 
document.getElementById("AdLayer2").style.display="none"; 
}
document.write("<div id=AdLayer1 style='position: absolute;visibility:hidden;z-index:1'><a onclick=closeid()><img src=images/piao-left1.png width='13px' height='250px' border='0'></a><a href='http://www.chenggong.edu.cn' target='_blank'><img src=images/piao-left21.png width='83px' height='414px' border='0'></a></div>"+"<div id=AdLayer2 style='position: absolute;visibility:hidden;z-index:1'><a href='http://www.chenggong.edu.cn' target='_blank'><img src=images/piao-left21f.png width='83px' height='414px' border='0'></a><a onclick=closeid()><img src=images/piao-left1.png width='13px' height='250px' border='0'></a></div>");
initEcAd()