ad=new Array(3);
ad[0]="<iframe src='http://click.dtiserv2.com/Click820/3006013-23-58717' width=120 height=90 frameborder='no' scrolling='no'></iframe>";
ad[1]="<iframe src='http://click.dtiserv2.com/Click562/3132013-23-58717' width=120 height=90 frameborder='no' scrolling='no'></iframe>";
ad[2]="<iframe src='http://click.dtiserv2.com/Click601/3292002-23-58717' width=120 height=90 frameborder='no' scrolling='no'></iframe>";
adNo = Math.floor(Math.random() * 3);
document.write(ad[adNo]);