var iImages = 11;
var sImagesPath = '/gfx/slideshow/';
var aSlides = ['Slide1','Slide2','Slide3'];
var iCurrentSlide = 0;
var iCurrentImage = Math.floor(Math.random() * iImages) + 1;

function DoSlide() {
	if (iCurrentSlide >= aSlides.length) iCurrentSlide = 0;
	if (iCurrentImage > iImages) iCurrentImage = 1;
	
	var oSlide = $(aSlides[iCurrentSlide]);
	var oImage = oSlide.firstDescendant();
	
	oSlide.style.backgroundImage = 'url(' + oImage.src + ')';
	
	oImage.hide();
	oImage.src = sImagesPath + iCurrentImage + '.jpg';
	oImage.appear({
		beforeStart : function() {
			iCurrentImage++;
			iCurrentSlide++;

			if (iCurrentSlide < aSlides.length) {
				setTimeout(DoSlide,250);
			} else {
				setTimeout(DoSlide,4000);
			}
		}
	});
	
}

Event.observe(window,'load',DoSlide);