var screens =  new Array();
function navigateScreens(linkObj, isBack) {
	if (!screens || screens.length == 0) {
		initScreens();
	}
	var index;
	for (index = 0; index < screens.length; index++) {
		if (screens[index].style.display == "inline") {
			screens[index].style.display = "none";
			break;
		}
	}
	index = isBack ? --index : ++index;
	if (index < 0) index = screens.length - 1;
	if (index >= screens.length) index = 0;
	screens[index].style.display = "inline";
	linkObj.blur();
}

function initScreens() {
	var imgs = document.getElementsByTagName("img");
	for (var i = 0; i < imgs.length; i++) {
		if (imgs[i].className == "screenshot") {
			screens[screens.length] = imgs[i];
		}
	}
}