diff --git a/validator.coffee b/validator.coffee
new file mode 100644
index 0000000..3d344fe
--- /dev/null
+++ b/validator.coffee
@@ -0,0 +1,40 @@
+class Test
+  constructor: (@sel, @func, @errMsg) ->
+
+  run: -> if @func $(@sel).val() then null else @errMsg
+
+class Validator
+  constructor: (@errList) ->
+    @tests = []
+
+  addTest: (t) ->
+    @tests.push t
+
+  check: ->
+    $(@errList).empty()
+    valid = true
+    for t in @tests
+      error = t.run()
+      if error != null
+        $(@errList).append '<li>' + error + '</li>'
+        valid = false
+    valid
+
+emailRegex = /^([a-zA-Z0-9!#$%&'*\+\-\/=?^_`{|}~]+(?:\.*[a-zA-Z0-9!#$%&'*\+\-\/=?^_`{|}~]+)*)@([a-zA-Z0-9\-]+(?:\.[a-zA-Z0-9\-]+)+)$/
+upperCaseRegex = /.*[A-Z]+.*/
+digitRegex = /.*[0-9]+.*/
+
+v = new Validator 'ul.errors'
+v.addTest new Test 'input[type=text]', ((s) -> emailRegex.test s), 'Please enter a valid email address'
+v.addTest new Test 'input[type=password]', ((s) -> s.length >= 8), 'Your password should be at least 8 characters long'
+v.addTest new Test 'input[type=password]', ((s) -> upperCaseRegex.test s), 'Your password should contain at least one capital letter'
+v.addTest new Test 'input[type=password]', ((s) -> digitRegex.test s), 'Your password should contain at least one number (0-9)'
+
+$('ul.errors').empty()
+$('input[type=submit]').click (e) ->
+  if not v.check()
+    e.preventDefault()
+  else
+    $('form').submit()
+    alert 'Sign in successful!'
+  null
diff --git a/validator.js b/validator.js
index 860dab4..bdb5de0 100644
--- a/validator.js
+++ b/validator.js
@@ -1,7 +1,90 @@
+// Generated by CoffeeScript 1.12.6
+(function() {
+  var Test, Validator, digitRegex, emailRegex, upperCaseRegex, v;
 
-  //insert your code here
- 
-$(function(){
+  Test = (function() {
+    function Test(sel, func, errMsg) {
+      this.sel = sel;
+      this.func = func;
+      this.errMsg = errMsg;
+    }
 
-  //insert your code here
-});
+    Test.prototype.run = function() {
+      if (this.func($(this.sel).val())) {
+        return null;
+      } else {
+        return this.errMsg;
+      }
+    };
+
+    return Test;
+
+  })();
+
+  Validator = (function() {
+    function Validator(errList) {
+      this.errList = errList;
+      this.tests = [];
+    }
+
+    Validator.prototype.addTest = function(t) {
+      return this.tests.push(t);
+    };
+
+    Validator.prototype.check = function() {
+      var error, i, len, ref, t, valid;
+      $(this.errList).empty();
+      valid = true;
+      ref = this.tests;
+      for (i = 0, len = ref.length; i < len; i++) {
+        t = ref[i];
+        error = t.run();
+        if (error !== null) {
+          $(this.errList).append('<li>' + error + '</li>');
+          valid = false;
+        }
+      }
+      return valid;
+    };
+
+    return Validator;
+
+  })();
+
+  emailRegex = /^([a-zA-Z0-9!#$%&'*\+\-\/=?^_`{|}~]+(?:\.*[a-zA-Z0-9!#$%&'*\+\-\/=?^_`{|}~]+)*)@([a-zA-Z0-9\-]+(?:\.[a-zA-Z0-9\-]+)+)$/;
+
+  upperCaseRegex = /.*[A-Z]+.*/;
+
+  digitRegex = /.*[0-9]+.*/;
+
+  v = new Validator('ul.errors');
+
+  v.addTest(new Test('input[type=text]', (function(s) {
+    return emailRegex.test(s);
+  }), 'Please enter a valid email address'));
+
+  v.addTest(new Test('input[type=password]', (function(s) {
+    return s.length >= 8;
+  }), 'Your password should be at least 8 characters long'));
+
+  v.addTest(new Test('input[type=password]', (function(s) {
+    return upperCaseRegex.test(s);
+  }), 'Your password should contain at least one capital letter'));
+
+  v.addTest(new Test('input[type=password]', (function(s) {
+    return digitRegex.test(s);
+  }), 'Your password should contain at least one number (0-9)'));
+
+  $('ul.errors').empty();
+
+  $('input[type=submit]').click(function(e) {
+    if (!v.check()) {
+      e.preventDefault();
+    } else {
+      $('form').submit();
+      alert('Sign in successful!');
+    }
+    return null;
+  });
+
+}).call(this);