diff --git a/_includes/binary2.html b/_includes/binary2.html
index dd70016c..c9c82a9b 100644
--- a/_includes/binary2.html
+++ b/_includes/binary2.html
@@ -56,6 +56,9 @@
         max="255"
         onkeypress="return event.charCode >= 48 && event.charCode <= 57"
       />
+      <p id="input-error" style="color: red; display: none; font-size: 14px;">
+      Only numbers between 0 and 255 can be entered.
+      </p>
       <div class="active_operation">
         OR
       </div>
diff --git a/assets/js/module.js b/assets/js/module.js
index 0d2577ee..64077645 100644
--- a/assets/js/module.js
+++ b/assets/js/module.js
@@ -23,25 +23,54 @@ bit.fill(false);
 
 function set_bits()
 {
-    if(isNaN(document.getElementById("value_A").value) || document.getElementById("value_A").value > 255 || document.getElementById("value_A").value < 0 || isNaN(document.getElementById("value_B").value) || document.getElementById("value_B").value < 0 || document.getElementById("value_B").value > 255)
+    var errorEl = document.getElementById("input-error");
+    var bit_value;
+
+    if (
+        isNaN(document.getElementById("value_A").value) ||
+        document.getElementById("value_A").value > 255 ||
+        document.getElementById("value_A").value < 0 ||
+        isNaN(document.getElementById("value_B").value) ||
+        document.getElementById("value_B").value < 0 ||
+        document.getElementById("value_B").value > 255
+    )
     {
         document.getElementById("value_A").value = 0;
         document.getElementById("value_B").value = 0;
-        alert("Only numbers between 0 and 255 can be entered.");
-        set_bits();
+
+        if (errorEl) {
+            errorEl.style.display = "block";
+        }
     }
     else
     {
-        for(var i=0; i < 8; i++)
+        if (errorEl) {
+            errorEl.style.display = "none";
+        }
+
+        for (var i = 0; i < 8; i++)
         {
-            if((document.getElementById("value_A").value&Math.pow(2,i))>0) { bit_value = true; } else { bit_value = false; }
+            if ((document.getElementById("value_A").value & Math.pow(2, i)) > 0) {
+                bit_value = true;
+            } else {
+                bit_value = false;
+            }
+
             document.getElementById(i).innerHTML = bit_display[bit[i] = bit_value];
-            if((document.getElementById("value_B").value&Math.pow(2,i))>0) { bit_value = true; } else { bit_value = false; }
-            document.getElementById(i+8).innerHTML = bit_display[bit[i+8] = bit_value];
+
+            if ((document.getElementById("value_B").value & Math.pow(2, i)) > 0) {
+                bit_value = true;
+            } else {
+                bit_value = false;
+            }
+
+            document.getElementById(i + 8).innerHTML = bit_display[bit[i + 8] = bit_value];
         }
-        do_bitwise();
+
+        do_bitwise(operator);
     }
 }
+}
 
 function toggle_bit(column)
 {