window.onload=initEcAd;
function initEcAd() {
document.getElementById("divStayTopLeft").style.posTop = -200;
document.getElementById("divStayTopLeft").style.visibility = 'visible'
MoveLeftLayer('divStayTopLeft');

}
function MoveLeftLayer(layerName) {
var x = 5;
var y = 500;// 左侧广告距离页首高度
var diff = (document.documentElement.scrollTop + y - document.getElementById("divStayTopLeft").style.posTop)*.40;
var y = document.documentElement.scrollTop + y - diff;
eval("document.getElementById('divStayTopLeft').style.posTop = parseInt(y)");
eval("document.getElementById('divStayTopLeft').style.posRight = x");
setTimeout("MoveLeftLayer('divStayTopLeft');", 20);
}