diff --git a/public/javascripts/validation.js b/public/javascripts/validation.js
index 24c8fdf2e..923fb7fce 100644
--- a/public/javascripts/validation.js
+++ b/public/javascripts/validation.js
@@ -7,6 +7,9 @@ var Validation = {
     username: {
       characters: /^(|[A-Za-z0-9_]{0,32})$/,
       length: [6, 32]
+    }, 
+    email: {
+      characters: /^(([\w\.%\+\-]+)@([\w\-]+\.)+([\w]{2,}))(, *(([\w\.%\+\-]+)@([\w\-]+\.)+([\w]{2,})))*$/
     }
   },
   events: { 
@@ -15,10 +18,19 @@ var Validation = {
       if(!Validation.rules.username.characters.test(this.value + String.fromCharCode(evt.keyCode))) {
         evt.preventDefault();
       }
+    }, 
+    emailKeypress: function(evt) {
+      if(evt.keyCode === 0) { return; }
+      if(!Validation.rules.email.characters.test(this.value + String.fromCharCode(evt.keyCode))) {
+        $('#user_email').css('border-color', '#8B0000');
+      } else {
+        $('#user_email').css('border-color', '#666666');
+      }
     }
   }
 };
 
 $(function() { 
   $("#user_username").keypress(Validation.events.usernameKeypress);
+  $("#user_email").keypress(Validation.events.emailKeypress);
 });
diff --git a/spec/javascripts/validation-spec.js b/spec/javascripts/validation-spec.js
index ab1aa8931..f289f926d 100644
--- a/spec/javascripts/validation-spec.js
+++ b/spec/javascripts/validation-spec.js
@@ -7,6 +7,13 @@ describe("Validation", function() {
         });
       });
     });
+    describe("email", function() {
+      describe("characters", function() {
+         it("is the regex for checking if the input is a valid list of e-mail addresses", function() {
+           expect((typeof Validation.rules.email.characters.test === "function")).toBeTruthy();
+         });
+      });
+    });  
   });
   describe("events", function() { 
     describe("usernameKeypress", function() { 
@@ -16,5 +23,16 @@ describe("Validation", function() {
         expect(Validation.rules.username.characters.test("ffffffffffffffffffffffffffffffffff")).toBeFalsy();
       }); 
     });
+    describe("emailKeypress", function() {
+      it("colors the border red if the input seems to be a invalid list", function() {
+        expect(Validation.rules.email.characters.test("user@example.com")).toBeTruthy();
+        expect(Validation.rules.email.characters.test("user@example.com, user@example.com")).toBeTruthy();
+        expect(Validation.rules.email.characters.test("user@example.com, user@example.com, user@example.com")).toBeTruthy();
+        expect(Validation.rules.email.characters.test("user@example.com user@example.com")).toBeFalsy();
+        expect(Validation.rules.email.characters.test("user@examplecom")).toBeFalsy();
+        expect(Validation.rules.email.characters.test("userexample.com")).toBeFalsy();
+        expect(Validation.rules.email.characters.test("userexamplecom")).toBeFalsy();
+      });
+    });
   });
 });