var adNumber = Math.random() * 1000000000000000000;
var adZone = 'home';
if (dartZone) {
 adZone = dartZone; //let the page override the zone
}
var used_tiles = 0;
function getAdvertisement(bsize,tileOvrRd) {
 
 if (tileOvrRd) { 
  tileNum = tileOvrRd;  // overrides tile number if necessary
 } else {
  tileNum = getTile(bsize);
 }
 
 document.write('<script language="JavaScript" src="http://ad.doubleclick.net/adj/rainbow.we/'+ adZone +';sz=' + bsize + ';tile=' + tileNum + ';ord=' + adNumber
 + '?" type="text/javascript"></sc' + 'ript>');
 ++used_tiles;
}

function getTile(bsize) {
 var tileNum = 0;
 switch(bsize) {
  case "728x90":
  tileNum = 1;
  break;
  case "336x280,300x250":
  tileNum = 2;
  break;
  case "300x250":
  tileNum = 2;
  break;
  case "160x60,120x60":
  tileNum = 3;
  break;
  case "336x850,300x600,160x600":
  tileNum = 4;
  break;
  case "160x600":
  tileNum = 4;
  break;
  case "300x100":
  tileNum = 5;
  break;
  case "234x60":
  tileNum = 6;

 }
 
 if (used_tiles == 0) {
  tileNum = tileNum + ";dcopt=ist";  // checks for first banner called to ad pop-under ad
 }
 
 return tileNum;
}

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