var feature = 1;
function prev() {
	var featureTitle = document.getElementById("title"+feature);
	var featureSpan = document.getElementById("feature"+feature);
	featureTitle.style.visibility = "hidden";
	featureTitle.style.display = "none";
	featureSpan.style.visibility = "hidden";
	featureSpan.style.display = "none";
	feature--;
	if (feature == 0) feature = 4;
	featureTitle = document.getElementById("title"+feature);
	featureSpan = document.getElementById("feature"+feature);
	featureTitle.style.visibility = "visible";
	featureTitle.style.display = "block";
	featureSpan.style.visibility = "visible";
	featureSpan.style.display = "inline";
}
function next() {
	var featureTitle = document.getElementById("title"+feature);
	var featureSpan = document.getElementById("feature"+feature);
	featureTitle.style.visibility = "hidden";
	featureTitle.style.display = "none";
	featureSpan.style.visibility = "hidden";
	featureSpan.style.display = "none";
	feature++;
	if (feature == 5) feature = 1;
	featureTitle = document.getElementById("title"+feature);
	featureSpan = document.getElementById("feature"+feature);
	featureTitle.style.visibility = "visible";
	featureTitle.style.display = "block";
	featureSpan.style.visibility = "visible";
	featureSpan.style.display = "inline";
}