//	Faces.js
//	Original code by T.K.Egan - 7 Oct 2005 except where noted
//	License: none
//		Use as you will but I'd appreciate an
//		email at tkegan@greenneondesign.com if 
//		you find a way to improve the code

var selectedSlideID = 0;

function displayNextSlide() { // implementation of functionality for next button
	var nextSlideID = selectedSlideID + 1;
	if(nextSlideID > numSlides) {	// wrap to first slide if outside bounds
		nextSlideID = 1;
	}
	var e = document.getElementById("" + nextSlideID);
	e.style.display="block";
	e = document.getElementById("" + selectedSlideID);
	e.style.display="none";
	selectedSlideID = nextSlideID;
}

function displayPreviousSlide() { // implementation of functionality for previous button
	var previousSlideID = selectedSlideID - 1;
	if(previousSlideID < 1) {	// wrap to last slide if outside bounds
		previousSlideID = numSlides;
	}
	var e = document.getElementById("" + previousSlideID);
	e.style.display="block";
	e = document.getElementById("" + selectedSlideID);
	e.style.display="none";
	selectedSlideID = previousSlideID;
}
		
function init() {	// change the loading slide visible by default to a random slide
	var randomSlideID = Math.ceil(Math.random() * numSlides);
	var e = document.getElementById("" + randomSlideID);
	e.style.display="block";
	selectedSlideID = randomSlideID;
}

if(document.getElementById) { 
	addLoadEvent(init);
}