var curRotImgNum = 1;
function nextRotationImage() {
	// fade existing image out
	Ext.get('rotImg'+curRotImgNum).fadeOut();
	curRotImgNum = curRotImgNum + 1;
	curRotImgNum = Ext.get('rotImg'+curRotImgNum) == null ? 1 : curRotImgNum;
	Ext.get('rotImg'+curRotImgNum).fadeIn();
	setTimeout(nextRotationImage,5000);
}
setTimeout(nextRotationImage,5000);