document.write("<table width='580' border='0' cellspacing='0' cellpadding='0' height='60'>");
document.write("<tr>");
document.write("<td width='550'>");
var ad= new Array(2);
ad[1]="<a href=http://www.pcauto.com.cn/autobbs/activity/11guesscar/ target='_blank'><img src=http://www.pcauto.com.cn/autobbs/activity/11guesscar/banner/550x60.gif border=0></a>";
ad[0]="<a href=http://www.pcauto.com.cn/autobbs/activity/years/ target='_blank'><img src=http://www.pcauto.com.cn/autobbs/images/banner/200410years_55060.gif border=0></a>";
ad_now = new Date();
ad_id= ad_now.getSeconds() %2;
document.write(ad[ad_id]);
document.write("</td>");
document.write("</tr>");
document.write("</table>");