var total_num_ads = 7;
var random_number = Math.random();
var ad_num = Math.round( (total_num_ads - 1) * random_number) + 1;
var ad_width="468";
var ad_height="60";

if (ad_num==2) {  //3/25/2008 - 12/31/2009
URL="http://www.kurveygirl.com/shop";  
alt_text="KurveyGirl.com";
banner_source="images/ad_images/banner_kurveygirl.gif";
}
else if (ad_num==3) {  //month-to-month starting 10/24/08
URL="http://www.npsracing.com";  
alt_text="NPS Racing";
banner_source="images/ad_images/banner_npsracing.gif";
}
else if (ad_num==4) {  //from 10/15/2009 to 4/15/2010)
URL="http://www.35motorsports.com";
alt_text="35 Motorsports";
banner_source="images/ad_images/banner_35motorsports.gif";
}
else if (ad_num==5) { //month-to-month
URL="http://www.tenn2cycles.com/";
alt_text="Tenn 2 Cycles";
banner_source="images/ad_images/banner_tenn2cycles.gif";
}
else if (ad_num==6) {  //WERA sponsor ad, went up 4/23/09
URL="http://www.ridersdiscount.com/";
alt_text="Riders Discount";
banner_source="images/ad_images/banner_ridersdiscount.gif";
}
else if (ad_num==1) {  //month-to-month
URL="http://www.lithiummotorsports.com";
alt_text="Lithium Motorsports";
banner_source="images/ad_images/banner_lithium.gif";
}
else if (ad_num==7) {
URL="advertise.htm";
alt_text="Advertise on the WERA BBS!";
banner_source="images/ad_images/advertise2.gif";
}
else {
URL="advertise.htm";
alt_text="Advertise on the WERA BBS!";
banner_source="images/ad_images/advertise2.gif";
}

document.write('<a href=\"' + URL + '\" target=\"_blank\">');
document.write('<img src=\"' + banner_source + '\" width=')
document.write(ad_width + ' height=' + ad_height + ' ');
document.write('alt=\"' + alt_text + '\" border=0></a><br>');
//document.write('<input type=\"hidden\" name=\"ad\" value=\"' + ad + '\">');