var NumberOfAds = 4;

var now = new Date()

var sec = now.getSeconds()

var AdNumber = sec % NumberOfAds;

AdNumber +=1;



if (AdNumber==1)



{



 url="http://www.zipcar.com/arlington/";

 Graphic="http://www.commuterpage.com/ads/120x120/zipcar_120x120.gif";

 width = "120"

 height = "120"

 

}




if (AdNumber==2)



{



 url="http://www.commuterpage.com/mobilestore.htm";

 Graphic="http://www.commuterpage.com/ads/120x120/mobilest120x120.gif";

 width = "120"

 height = "120"

 

}

if (AdNumber==3)



{



 url="http://www.flexcar.com/washingtondc/default.asp";

 Graphic="http://www.commuterpage.com/ads/120x120/flexcar_120x120.gif";

 width = "120"

 height = "120"

 

}

if (AdNumber==4)



{



 url="http://www.commuterpage.com/corporate/index.cfm/";

 Graphic="http://www.commuterpage.com/ads/120x120/corporate120x120.gif";

 width = "120"

 height = "120"





}



document.write('<center>');

document.write('<a href=\"' + url + '\">');

document.write('<img src=\"' + Graphic + '\" width=')

document.write(width + ' height=' + height + ' ');

document.write('border=0><br>');

document.write('</a>');

document.write('</center>');