var imgDir = "images";
var lgPrefix = "nest_large_";
var suffix = ".jpg";
var imgName = "largeImg";

// Function to swap a large image based on the thumbnail clicked.
// idx = Index for image to load
function swapImg(idx) {
	if(document.images) {
		var imgSource = imgDir + "/" + lgPrefix + idx + suffix;
		document.images[imgName].src = imgSource;
	}
}