diff --git a/uhr.js b/uhr.js
index 58deffe..23203a8 100644
--- a/uhr.js
+++ b/uhr.js
@@ -18,6 +18,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
  * @param themeElement Das HTML-Stylesheet-Tag, das das Theme-CSS referenziert.
  */
 function Uhr(clockarea, themeElement) {
+	this.id = Uhr.id++;
 	this.clockarea = this.initClockarea(clockarea);
 	this.toggleSwitch = this.initToggleSwitch();
 	this.letterarea = clockarea.find('.letterarea');
@@ -27,6 +28,7 @@ function Uhr(clockarea, themeElement) {
 	this.currentLayout = Uhr.layouts['undefined'];
 	this.currentMinute = -1;
 }
+Uhr.id = 0;
 Uhr.layouts = new Array();
 Uhr.register = function (locale, layout) {
 	Uhr.layouts[locale] = layout;
@@ -150,13 +152,13 @@ Uhr.prototype.initClockarea = function(clockarea) {
 }
 Uhr.prototype.initToggleSwitch = function() {
 	var toggleSwitch = $('<div class="onoffswitch"></div>');
-	var input = $('<input type="checkbox" name="onoffswitch" class="onoffswitch-checkbox" id="onoffswitch" checked="checked" />');
+	var input = $('<input type="checkbox" name="onoffswitch' + this.id + '" class="onoffswitch-checkbox" id="onoffswitch' + this.id + '" checked="checked" />');
 	var uhr = this;
 	input.on('click', function() {
 		uhr.toggle();
 	});
 	toggleSwitch.append(input);
-	toggleSwitch.append('<label class="onoffswitch-label" for="onoffswitch">'
+	toggleSwitch.append('<label class="onoffswitch-label" for="onoffswitch' + this.id + '">'
 		+ '<div class="onoffswitch-inner"></div>'
 		+ '<div class="onoffswitch-switch"></div>'
 		+ '</label>');