function startSwap() {
	//alert (banner.length);
	fadeImage();
}

function fadeImage() {

	new Effect.Fade(document.getElementById("banner"),{ duration:1.0, afterFinish: changeImage} );

}

function changeImage() {

	document.getElementById("banner").src = bannerPrefix + banner[imageNumber];
	appearImage();

}

function appearImage() {

	new Effect.Appear(document.getElementById("banner"),{ duration:1.0 } );
	imageNumber++;

	if ( imageNumber == banner.length ) {
		imageNumber = 0;
	}

}