var slideShow = new Array();
var loadImages = new Array();

var duration = 5000;
var currentSlide = 0;

var slideDir = "imgs/slides/";
var smExt = ".gif";

var ordered = true;
var firstloop =  true;

function makeSlide(n, t){
	this.filename = n;
	this.text = t;
}
function initSlide(){
	if(document.images.slideSwap){
		slideShow[0]= new makeSlide("global", "Global Infant Mortality Rates & Hunger");
		slideShow[1]= new makeSlide("Africa_global_hunger", "Africa Global Hunger");
		slideShow[2]= new makeSlide("4ctryAfrica_GE_1", "Africa");
		slideShow[3]= new makeSlide("MWI_ADM3_FGT_0", "Malawi");
		slideShow[4]= new makeSlide("MWI_ADM3_primary_FGT_1", "Malawi");
		PreLoadImages();   
	}else{ return true; }
}
function PreLoadImages(){
	var p = slideShow.length;
	for (i = 0; i < p; i++){
		loadImages[i] = new Image()
		loadImages[i].src = slideDir+slideShow[i].filename+smExt;
		loadImages[i].alt = slideShow[i].text;
	}  
	if (ordered == true){ NextOrderedSlide();
	}else{ NextRandomSlide(); }
	return true;
}
function NextRandomSlide(){  
	do { n = Math.floor(Math.random() * (loadImages.length)); } 
	while( n == this.currentSlide );
		this.currentSlide = n;
		document.images.slideSwap.src = loadImages[n].src
		t = setTimeout('NextRandomSlide()', duration)   
}
function NextOrderedSlide(){ //not the best way to do this, should crawl through array, but for now it works ;-) (will fix later)
	if(firstloop){
		firstloop = false;
	}else if(currentSlide < slideShow.length-1){
		currentSlide++;
	}else if(currentSlide >= slideShow.length-1){
		currentSlide = 0;
	}
	document.images.slideSwap.src = loadImages[currentSlide].src
	t = setTimeout('NextOrderedSlide()', duration)
}

window.onload=initSlide;