(100分)急用:请帮我修改一下我的对联式广告的代码,我要在两边的广告上或下面再各加一个广告位置.

试一试：
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<SCRIPT LANGUAGE="JavaScript">
<!--function initEcAd(top,d1,d2) {
var od1 = document.getElementById(d1);
var od2 = document.getElementById(d2);
od1.style.posTop = top;
od1.style.visibility = 'visible'
od2.style.posTop = top;
od2.style.visibility = 'visible'
MoveLeftLayer(d1);
MoveRightLayer(d2);
}
function MoveLeftLayer(layerName) {
var x = 5;
var y = 340;
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 = 340;
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);
} 
document.write("<div id=AdLayer1 style='position: absolute;visibility:hidden;z-index:1'><a href='http://www.jiajiang.net' target=_blank><img src=http://gongxun.net/shoppics/%B7%FE%D7%B0/ONLY%20%D0%A1/2005221201927947.jpg width= 96 height= 60 ></div>"
+"<div id=AdLayer2 style='position: absolute;visibility:hidden;z-index:1'><a href='http://www.jiajiang.net'target=_blank><img src=./images/default/logo.gif width= 100  height= 40></div>");
initEcAd(-100,"AdLayer1","AdLayer2")document.write("<div id=AdLayer3 style='position: absolute;visibility:hidden;z-index:1'><a href='http://www.jiajiang.net' target=_blank><img src=http://gongxun.net/shoppics/%B7%FE%D7%B0/ONLY%20%D0%A1/2005221201927947.jpg width= 96 height= 60 ></div>"
+"<div id=AdLayer4 style='position: absolute;visibility:hidden;z-index:1'><a href='http://www.jiajiang.net'target=_blank><img src=./images/default/logo.gif width= 100  height= 40></div>");
initEcAd(-600,"AdLayer3","AdLayer4")//-->
</SCRIPT>