var imageNames = Array('img1.jpg', 'img2.jpg', 'img3.jpg', 'img4.jpg');
var currentImage = "none";
var secondsToSwitch = 30000;// seconds in ms...5000 = 5 seconds
var dir = "img/students/HS/";

$(document).ready(function()
{ 
	//assign initial image
	currentImage = PickImage();
	SetImage(currentImage);
	//run update
	setInterval( "UpdateImages()", secondsToSwitch );
}); 


//UPDATE!!!!!!!!!!
function UpdateImages()
{
   currentImage = PickImage();
   SetImage(currentImage);
}
//set image
function SetImage(img)
{
	var imgPath = dir + img;
	//alert(imgPath);
	$('img#random_image').hide();
	//change in html
	$('img#random_image').attr( {
		src: imgPath
	});
	$('img#random_image').fadeIn(2000);
	
}
//randomly pick image different from current
function PickImage()
{
	var newImage = currentImage;
	while(currentImage == newImage)
	{
		var index = Math.floor(Math.random()*imageNames.length);
		newImage = imageNames[index];
	}
	
	return newImage;
}