diff --git a/Web/js/functions.js b/Web/js/functions.js
index 191a759..bd07358 100644
--- a/Web/js/functions.js
+++ b/Web/js/functions.js
@@ -12,7 +12,7 @@ function sizeAndPos() {
     'width' : w,
     'height' : h
   });
-  alert($(window).height());
+  alert(window.devicePixelRatio);
   c.clearRect(0,0, width(), height());
   c.putImageData(data, 0, 0);
 }