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document.write('#leftAd{width:160px; height:160px; position:fixed; top:100px; left:0; z-index:100;}');
document.write('#leftAd{_margin-top:100px; _position: absolute; _top:expression((100+(noValue = document.documentElement.scrollTop?document.documentElement.scrollTop : document.body.scrollTop))+\'px\');}');
document.write('</style>');

document.write('<div id="leftAd"><a href="/ad/201219160228261.html" target="_blank"><img src="/images/ad20120109.jpg" width="160" height="160" alt="" /></a></div>');