var browser={ie6:function(){return((window.XMLHttpRequest==undefined)&&(ActiveXObject!=undefined))},getWindow:function(){var myHeight=0;var myWidth=0;if(typeof(window.innerWidth)=='number'){myHeight=window.innerHeight;myWidth=window.innerWidth}else if(document.documentElement){myHeight=document.documentElement.clientHeight;myWidth=document.documentElement.clientWidth}else if(document.body){myHeight=document.body.clientHeight;myWidth=document.body.clientWidth}return{'height':myHeight,'width':myWidth}},getScroll:function(){var myHeight=0;var myWidth=0;if(typeof(window.pageYOffset)=='number'){myHeight=window.pageYOffset;myWidth=window.pageXOffset}else if(document.documentElement){myHeight=document.documentElement.scrollTop;myWidth=document.documentElement.scrollLeft}else if(document.body){myHeight=document.body.scrollTop;myWidth=document.body.scrollLeft}return{'height':myHeight,'width':myWidth}},getDocWidth:function(D){if(!D)var D=document;return Math.max(Math.max(D.body.scrollWidth,D.documentElement.scrollWidth),Math.max(D.body.offsetWidth,D.documentElement.offsetWidth),Math.max(D.body.clientWidth,D.documentElement.clientWidth))},getDocHeight:function(D){if(!D)var D=document;return Math.max(Math.max(D.body.scrollHeight,D.documentElement.scrollHeight),Math.max(D.body.offsetHeight,D.documentElement.offsetHeight),Math.max(D.body.clientHeight,D.documentElement.clientHeight))}};var dom={ID:function(id){var type=typeof(id);if(type=='object')return id;if(type=='string')return document.getElementById(id);return null},insertHtml:function(html){var frag=document.createDocumentFragment();var div=document.createElement("div");div.innerHTML=html;for(var i=0,ii=div.childNodes.length;i<ii;i++){frag.appendChild(div.childNodes[i])}document.body.insertBefore(frag,document.body.firstChild)}};var myEvent={add:function(element,type,handler){var ele=dom.ID(element);if(!ele)return;if(ele.addEventListener)ele.addEventListener(type,handler,false);else if(ele.attachEvent)ele.attachEvent("on"+type,handler);else ele["on"+type]=handler},remove:function(element,type,handler){var ele=dom.ID(element);if(!ele)return;if(ele.removeEventListener)ele.removeEventListener(type,handler,false);else if(ele.detachEvent)ele.detachEvent("on"+type,handler);else ele["on"+type]=null}};var position={rightCenter:function(id){var id=dom.ID(id);var ie6=browser.ie6();var win=browser.getWindow();var ele={'height':id.clientHeight,'width':id.clientWidth};if(ie6){var scrollBar=browser.getScroll()}else{var scrollBar={'height':0,'width':0};id.style.position='fixed'}ele.top=parseInt((win.height-ele.height)/2+scrollBar.height);id.style.top=ele.top+'px';id.style.right='3px'},floatRightCenter:function(id){position.rightCenter(id);var fun=function(){position.rightCenter(id)};if(browser.ie6()){myEvent.add(window,'scroll',fun);myEvent.add(window,'resize',fun)}else{myEvent.add(window,'resize',fun)}},leftCenter:function(id){var id=dom.ID(id);var ie6=browser.ie6();var win=browser.getWindow();var ele={'height':id.clientHeight,'width':id.clientWidth};if(ie6){var scrollBar=browser.getScroll()}else{var scrollBar={'height':0,'width':0};id.style.position='fixed'}ele.top=parseInt((win.height-ele.height)/2+scrollBar.height);id.style.top=ele.top+'px';id.style.left='3px'},floatLeftCenter:function(id){position.leftCenter(id);var fun=function(){position.leftCenter(id)};if(browser.ie6()){myEvent.add(window,'scroll',fun);myEvent.add(window,'resize',fun)}else{myEvent.add(window,'resize',fun)}}};

function ad_left(){
    var html;
    html = '<div id="ad_left" style="position:absolute;width:130px;height:300px;z-index:10001"><a style="position:absolute;top:-15px;left:0;" href="javascript:void(0);" onclick="document.getElementById(\'ad_left\').style.display=\'none\'">关闭</a><a href="http://www.51138.cn"><img src="images/ad.jpg" width="195" height="195" /></a></div>';
    dom.insertHtml(html);position.floatLeftCenter('ad_left');
}
function ad_right(){
    var html;
    html = '<div id="ad_right" style="position:absolute;width:195px;height:650px;z-index:10001"><a style="position:absolute;top:-15px;right:0;" href="javascript:void(0);" onclick="document.getElementById(\'ad_right\').style.display=\'none\'">关闭</a><a href="http://www.51138.cn"><img src="images/ad.jpg" width="195" height="650" /></a></div>';
    dom.insertHtml(html);position.floatRightCenter('ad_right');
}

myEvent.add(window,'load',ad_right);

对联浮动广告js代码
可以自己根据需求调大小
调整是否需要

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