adImages = new Array("picsgrad/teaching1.jpg", "picsgrad/labschool.jpg", "picsgrad/100_1014.jpg", "picsgrad/facpos2.jpg", "picsgrad/pos1.jpg","picsgrad/teaching2.jpg")	
	thisAd = 0
	imgCt = adImages.length
	function rotate() {
		if (document.images && document.adBanner!=null) {
			thisAd++
			if (thisAd == imgCt) {
				thisAd = 0
			}
			document.adBanner.src=adImages[thisAd]
		  	setTimeout("rotate()", 5 * 1000)
	  	}
	}