// images.js

selected="";

function showImage(button, url, caption) {

	var btn = document.getElementById(button);
	
	if (btn != selected) {
	
		btn.className = "activeImageMenuItem";
		
		var img = document.getElementById("imageContainer");
		img.innerHTML = '<img src="./screenshots/' + url + '"></img>';
	
		var cap = document.getElementById('caption');
		cap.innerHTML = caption;
	

		if (selected != "") {
			selected.className = "imageMenuItem";	
			}
		
		selected = btn;
	}
		
}