如何在网页两边显示随滚动条滚动的广告

 

<!-- ********广告和弹出窗口代码******** --> 
        <SCRIPT language=javascript>
            function closecfadw1()
            {
            cfadw1.style.visibility='hidden';
            } 
            function closecfadw2()
            {
            cfadw2.style.visibility='hidden';
            } 
            var specialcode="<DIV id=cfadw1 style='Z-INDEX: 100; right: 1px; POSITION: absolute; TOP: 30px;'><TABLE cellSpacing=0 cellPadding=0 width=102 style='font-size:12px;color:#ffffff'><TR bgcolor=#C54A00><TD height=20> 推荐↓</TD><TD style='CURSOR: hand' onclick='closecfadw1()' width=30>关 闭</TD></TR></TABLE><iframe WIDTH=102 HEIGHT=232 align=center MARGINWIDTH=0 Name=hscfw MARGINHEIGHT=0 HSPACE=0 VSPACE=0 FRAMEBORDER=0 SCROLLING=no src=http://></iframe></DIV>";
            document.write(specialcode);
            lastScrollX=0;
            function cfsclw1(){
            diffY=document.documentElement.scrollTop;
            percent=.1*(diffY-lastScrollX);
            if(percent>0)percent=Math.ceil(percent);
            else
            percent=Math.floor(percent);document.all.cfadw1.style.pixelTop+=percent;lastScrollX=lastScrollX+percent;
            }
            window.setInterval("cfsclw1()",1);

            var specialcode2="<DIV id=cfadw2 style='Z-INDEX: 100; left: 1px; POSITION: absolute; TOP: 30px;'><TABLE cellSpacing=0 cellPadding=0 width=102 style='font-size:12px;color:#ffffff'><TR bgcolor=#12BDFF><TD height=20> 推荐↓</TD><TD style='CURSOR: hand' onclick='closecfadw2()' width=30>关 闭</TD></TR></TABLE><iframe WIDTH=102 HEIGHT=232 align=center MARGINWIDTH=0 Name=hscfw MARGINHEIGHT=0 HSPACE=0 VSPACE=0 FRAMEBORDER=0 SCROLLING=no src=http://></iframe></DIV>";
            document.write(specialcode2);
            lastScrollY=0;
            function cfsclw2(){
            diffY=document.documentElement.scrollTop;
            percent=.1*(diffY-lastScrollY);
            if(percent>0)percent=Math.ceil(percent);
            else 
            percent=Math.floor(percent);
            document.all.cfadw2.style.pixelTop+=percent;lastScrollY=lastScrollY+percent;}window.setInterval("cfsclw2()",1);
        </SCRIPT>