diff --git a/htdocs/frontend/javascripts/frontend.js b/htdocs/frontend/javascripts/frontend.js
index e1e672c..6d0dcf6 100644
--- a/htdocs/frontend/javascripts/frontend.js
+++ b/htdocs/frontend/javascripts/frontend.js
@@ -38,17 +38,22 @@ vz.wui.init = function() {
 	$('button, input[type=button],[type=image]').button();
 	$('button[name=options-save]').click(function() { vz.options.save(); });
 	$('#permalink').click(function() {
+		var uuids = [];
 		var url = window.location.protocol + '//' +
 			window.location.host +
 			window.location.pathname +
 			'?from=' + vz.options.plot.xaxis.min +
 			'&to=' + vz.options.plot.xaxis.max;
-		
+
 		vz.entities.each(function(entity, parent) {
 			if (entity.active) {
-				url += '&uuid=' + entity.uuid;
+				uuids.push(entity.uuid);
 			}
 		});
+		
+		uuids.unique().each(function(key, value) {
+			url += '&uuid=' + value;
+		});
 
 		window.location = url;
 	});
diff --git a/htdocs/frontend/javascripts/helper.js b/htdocs/frontend/javascripts/helper.js
index b4c40a0..a5f2da1 100644
--- a/htdocs/frontend/javascripts/helper.js
+++ b/htdocs/frontend/javascripts/helper.js
@@ -55,8 +55,9 @@ var Exception = function(type, message, code) {
  * according to js language specification ECMA 1.6
  */
 Array.prototype.indexOf = function(n) {
-	for (var i = 0, l = this.length; i < l; i++)
+	for (var i = 0, l = this.length; i < l; i++) {
 		if (n == this[i]) return i;
+	}
 };
 
 Array.prototype.remove = function(n) {
@@ -64,8 +65,9 @@ Array.prototype.remove = function(n) {
 };
 
 Array.prototype.each = function(cb) {
-	for (var i = 0, l = this.length; i < l; i++)
+	for (var i = 0, l = this.length; i < l; i++) {
 		cb(i, this[i]);
+	}
 };
 
 Array.prototype.contains = function(n) {
@@ -75,3 +77,15 @@ Array.prototype.contains = function(n) {
 Array.prototype.clear = function() {
 	this.length = 0;
 }
+
+Array.prototype.unique = function () {
+	var r = new Array();
+	
+	this.each(function(key, value) {
+		if (!r.contains(value)) {
+			r.push(value);
+		}
+	});
+	
+	return r;
+}