var now = new Date();
var seconds = now.getSeconds();
var ImgSrc = new Array('http://ad.tom.com/tomad/page/pip-lb.htm','http://ad.tom.com/tomad/page/sms-p1.htm','http://ad.tom.com/tomad/page/sms-p2.htm','http://ad.tom.com/tomad/page/pip-lb1.htm','http://ad.tom.com/tomad/page/pip-lb2.htm');
MmsPop = seconds % ImgSrc.length;
document.write('<table align=left  border=0 cellspacing=2 cellpadding=2 ><tr><td>');
document.write('<iframe src="'+ImgSrc[MmsPop]+'" width="360" height="300" frameborder="no" border="0" marginwidth="0" marginheight="0" scrolling="no"></iframe></td></tr></table>');