function getRandomAd(adArray) {
			randomPercentage = Math.floor(Math.random()*100);
			adIndex = getAdInPercentage(adArray, randomPercentage);
			ad = adArray[adIndex];

			if (ad != null) {
				adSetTarget(ad[0]);
				htmlAdWH(ad[1], ad[2], ad[3]);
				adSetType('');
			}

		}

		function getAdInPercentage(adArray, randomPercentage) {
			ad = null;
			totalPercentage = 0;
			for (i = 0; i < adArray.length; i++) {
				ad = adArray[i];
				adPercentage = ad[3];
				totalPercentage += adPercentage;
				if (randomPercentage <= totalPercentage) {
					return i;
				}

			}

			return 0;
		}