diff --git a/4chan_x.user.js b/4chan_x.user.js
index c56782b70..4f9661067 100644
--- a/4chan_x.user.js
+++ b/4chan_x.user.js
@@ -232,19 +232,11 @@
     drag: function(e) {
       var bottom, left, right, style, top;
       left = e.clientX - ui.dx;
-      if (left < 10) {
-        left = '0';
-      } else if (ui.width - left < 10) {
-        left = null;
-      }
-      right = left ? null : 0;
       top = e.clientY - ui.dy;
-      if (top < 10) {
-        top = '0';
-      } else if (ui.height - top < 10) {
-        top = null;
-      }
-      bottom = top ? null : 0;
+      left = left < 10 ? 0 : ui.width - left < 10 ? null : left;
+      top = top < 10 ? 0 : ui.height - top < 10 ? null : top;
+      right = left === null ? 0 : null;
+      bottom = top === null ? 0 : null;
       style = ui.el.style;
       style.top = top;
       style.right = right;
diff --git a/script.coffee b/script.coffee
index ec8467fff..0db57fb60 100644
--- a/script.coffee
+++ b/script.coffee
@@ -152,13 +152,17 @@ ui =
     ui.height = d.body.clientHeight - el.offsetHeight
   drag: (e) ->
     left = e.clientX - ui.dx
-    if left < 10 then left = '0'
-    else if ui.width - left < 10 then left = null
-    right = if left then null else 0
     top = e.clientY - ui.dy
-    if top < 10 then top = '0'
-    else if ui.height - top < 10 then top = null
-    bottom = if top then null else 0
+    left =
+      if left < 10 then 0
+      else if ui.width - left < 10 then null
+      else left
+    top =
+      if top < 10 then 0
+      else if ui.height - top < 10 then null
+      else top
+    right = if left is null then 0 else null
+    bottom = if top is null then 0 else null
     #using null instead of '' is 4% faster
     #these 4 statements are 40% faster than 1 style.cssText
     {style} = ui.el