function MoveLeftLayer(layerName) { 
var x = 10; 
var y = 100;// 左侧广告距离页首高度 
var scrollPos; 
if (typeof window.pageYOffset != 'undefined') { 
scrollPos = window.pageYOffset; 
} 
else if (typeof document.compatMode != 'undefined' && 
document.compatMode != 'BackCompat') { 
scrollPos = document.documentElement.scrollTop; 
} 
else if (typeof document.body != 'undefined') { 
scrollPos = document.body.scrollTop; 
} 


var diff = (scrollPos + y - document.all.AdLayer1.style.posTop)*.40; 
var y = scrollPos + 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 = 100; 
var y = 10;// 右侧广告距离页首高度 
var scrollPos; 
if (typeof window.pageYOffset != 'undefined') { 
scrollPos = window.pageYOffset; 
} 
else if (typeof document.compatMode != 'undefined' && 
document.compatMode != 'BackCompat') { 
scrollPos = document.documentElement.scrollTop; 
} 
else if (typeof document.body != 'undefined') { 
scrollPos = document.body.scrollTop; 
} 


var diff = (scrollPos + x - document.all.AdLayer1.style.posTop)*.40; 
var x = scrollPos + x - diff; 
eval("document.all." + layerName + ".style.posTop = parseInt(x)"); 
eval("document.all." + layerName + ".style.posRight = y"); 
setTimeout("MoveRightLayer('AdLayer2');", 20); 
}