diff --git a/js/page_functionality.js b/js/page_functionality.js
new file mode 100644
index 0000000..d19d639
--- /dev/null
+++ b/js/page_functionality.js
@@ -0,0 +1,79 @@
+
+var current_section = "section-1";
+
+function toggleVisibility(id) {
+    var x = document.getElementById(id);
+    if (x.style.display == "none") {
+        x.style.display = "block";
+    } else {
+        x.style.display = "none";
+    }
+}
+
+function switchSection(s) {
+    setTimeout(function(){ 
+        toggleVisibility(current_section);
+        toggleVisibility(s);
+        current_section = s;
+    }, 75);
+}
+
+const idsFormulari = {
+  room: "1063142948",
+  day: "2115504093",
+  begins: "1749141911",
+  ends: "1827359679",
+  rows: {
+    A: "208184485",
+    B: "1077148310",
+    C: "642851281",
+    D: "1686039024",
+    E: "697835787",
+    F: "1511799646",
+    G: "809853432",
+    H: "182597499",
+    I: "1890539481",
+    J: "529159478",
+    K: "1615241874",
+    L: "1334263875"
+  },
+  notes: "1600275159"
+};
+const formBaseUrl = "https://docs.google.com/forms/d/e/1FAIpQLSfT9o287VqLyhwR8LPdloAQWhuqCgA3NfdhgP5vb9_sVQHL-g/viewform";
+
+function sendForm() {
+    // Add subject to user
+    fetch(api_url + "addUserSubject", {
+      "method": "POST",
+      "body": JSON.stringify({
+                subject: final_JSON.class.subject_id
+              }),
+      "mode": "cors",
+      "credentials": "include"
+    })
+    .then(res => res.json())
+    .then(json => {
+      console.log("Subject added to user: ", json);
+
+      var begins = new Date(parseInt(final_JSON.class.begins)*1000);
+      var ends = new Date(parseInt(final_JSON.class.ends)*1000);
+
+      var params = new URLSearchParams();
+      params.append("entry." + idsFormulari.room, final_JSON.class.room); // class, number, letter
+      params.append("entry." + idsFormulari.day, begins.getFullYear().toString() + '-' + (begins.getMonth() + 1).toString().padStart(2, "0") + '-' + begins.getDate().toString().padStart(2, "0"));
+      params.append("entry." + idsFormulari.begins, formatDate(begins));
+      params.append("entry." + idsFormulari.ends, formatDate(ends));
+      params.append("entry." + idsFormulari.rows[final_JSON.letter], 'Columna ' + final_JSON.number);
+      // params.append("entry." + idsFormulari.notes, '[Autogenerat per delefme/covid-tracability -- Assignatura seleccionada: ' + (final_JSON.class.friendly_name || final_JSON.class.calendar_name) + ']');
+
+      var formulari_link = formBaseUrl + '?' + params.toString() + '#i1';
+      window.location.href = formulari_link;
+    });
+ }
+ 
+ document.getElementById("send-button").addEventListener('click', function (el) {              
+    document.getElementById('send-button').classList.add('is-loading');
+
+    sendForm();
+ });
+