function swap(img,imgSrc) {
	document[img].src = imgSrc;
}

var previousSwap = 'o';
function swaphighlight(x,img,imgSrc) {

	if (previousSwap) {
		document.getElementById(previousSwap).style.border = "none";
	}

	previousSwap = x;
	document[img].src = imgSrc;
	document.getElementById(x).style.border = "2px solid #FFFFFF";
}


function nextImage() {
	var range = 10;
	return Math.floor(Math.random() * range) + 10;
}


function randomness(img) {
	var interval = 30;
	interval *= 1000;
	var imgSrc = nextImage();
	var recur_call = "randomness('"+img+"')";

	document[img].src = 'image/paintings/'+image_list[imgSrc];
	setTimeout(recur_call, interval);
}