diff --git a/index.html b/index.html
index c855d2b..8c5679f 100644
--- a/index.html
+++ b/index.html
@@ -4,21 +4,15 @@
     <meta charset="UTF-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <title>TAJ Validator</title>
-    <script src="script.js"></script>
+    <script src="script.js" async></script>
     <link rel="stylesheet" href="style.css" />
   </head>
   <body>
     <h1>TAJ Validator</h1>
 
     <form>
-      <input
-        type="text"
-        id="taj"
-        oninput="restrictInput(this, 'number')"
-        maxlength="9"
-        required
-      />
-      <button type="button" onclick="checkTAJ()">Ellenőrzés</button>
+      <input type="text" id="taj" oninput="restrictInput(this, 'number')" />
+      <button type="submit" onclick="checkTAJ()">Ellenőrzés</button>
     </form>
 
     <p id="result"></p>
diff --git a/script.js b/script.js
index 38ed9c3..18b12ee 100644
--- a/script.js
+++ b/script.js
@@ -1,28 +1,23 @@
 // Input 0
-function restrictInput(input) {
-  input.value = input.value.replace(/[^0-9]/g, '').slice(0, 9);
+function restrictInput(a) {
+  a.value = a.value.replace(/[^0-9]/g, "").slice(0, 9);
 }
-
 function validateTAJ(a) {
-  a = a.replace(/[^0-9]/g, '');
+  a = a.replace(/[^0-9]/g, "");
   if (9 != a.length) {
     return !1;
   }
-  for (var b = 0, d = '', c = 0; c < a.length; c++) {
-    7 >= c &&
-      ((b += 0 == (c + 1) % 2 ? 7 * parseInt(a[c]) : 3 * parseInt(a[c])),
-      (d += a[c]));
+  for (var c = 0, d = "", b = 0; b < a.length; b++) {
+    7 >= b && (c += 0 == (b + 1) % 2 ? 7 * parseInt(a[b]) : 3 * parseInt(a[b]), d += a[b]);
   }
-  return a == d + (b % 10);
+  return a == d + c % 10;
 }
-
 function checkTAJ() {
-  var a = document.querySelector('#taj'),
-    b = document.querySelector('#result');
-
-  validateTAJ(a.value)
-    ? ((b.textContent = 'A TAJ sz\u00e1m \u00e9rv\u00e9nyes.'),
-      (b.style.color = '#4CAF50'))
-    : ((b.textContent = 'A TAJ sz\u00e1m \u00e9rv\u00e9nytelen.'),
-      (b.style.color = '#FF5733'));
+  event.preventDefault();
+  var a = document.querySelector("#taj"), c = document.querySelector("#result");
+  a = validateTAJ(a.value);
+  c.textContent = a ? "A TAJ sz\u00e1m \u00e9rv\u00e9nyes." : "A TAJ sz\u00e1m \u00e9rv\u00e9nytelen.";
+  c.style.color = a ? "#4CAF50" : "#FF5733";
+  return a;
 }
+;
\ No newline at end of file
