myPix = new Array("http://www.giveaflight.com/linking/sky1.jpg","http://www.giveaflight.com/linking/sky2.jpg");
adURL = new Array("&ctl=sky1","&ctl=sky2");
imgCt = myPix.length;
thisAd = 0;
firstTime = true ;

window.onload = function choosePic() {
	if (document.images) {
		if (firstTime) {
			thisAd = Math.floor((Math.random() * imgCt));
			firstTime = false;
			} 
		else {
			thisAd++;
			if (thisAd == imgCt) {
				thisAd = 0;
				}
			}
		document.myPicture.src=myPix[thisAd];
	}
}
function newLocation() {
	document.location.href = "http://www.giveaflight.com/myschool.asp?sid=173" + adURL[thisAd];
}
document.write('<a href="javascript:newLocation()"><img name="myPicture" border="0" src="http://www.giveaflight.com/linking/sky1.jpg" width="120" height="600" alt="Give the Gift of Flight" /></a>')