使用Javascript/jQuery的if語句不工作

Question

我真的傷透了我的幾個腦細胞在這個單這看起來很簡單，但我不能得到它的工作 -

$(function() { 
    function check() { 
     var myname = $("#myname").val(); 
     var myemail = $("#myemail").val(); 
     var password = $("#password").val(); 
     var repeatpassword = $("#repeatpassword").val(); 

     if (myname == "") { 
      $("#mynameresult").append("Please Enter Your Name"); 
      return false; 
     } 
     if (myemail =="") { 
      $("#myemailresult").append("Please Enter Your Email"); 
      return false; 
     } 
     if (password == "") { 
      $("#passwordresult").append("Please Enter a Password"); 
      return false; 
     } 
     if (repeatpassword == "") { 
      $("#repeatpasswordresult").append("Please Repeat the Password"); 
      return false; 
     } 
     return true; 
    } 
}); 

我的長相形式像這樣 -

<table class="registrationform"> 

    <form method="post" onsubmit = "return check();" action="/ToDoneList/ToDoneList/usr/registrationparse.php" enctype="multipart/form-data" > 

    <tr><td>Username: </td><td><input class="focusfox" type="text" name="username" id="myname"></td><td id="mynameresult"></td></tr> 
    <tr><td>Email: </td><td><input type="text" name="email" id="myemail"></td><td id="myemailresult"></td></tr> 
    <tr><td>Password: </td><td><input type="password" name="password" id="password" /></td><td id="passwordresult"></td></tr> 
    <tr><td>Repeat the Password: </td><td><input type="password" name="repeatpassword" id="repeatpassword"/></td><td id="repeatpasswordresult"></td></tr>   
    <tr><td rowspan="2"><img id="captcha" src="/securimage/securimage_show.php" alt="CAPTCHA Image" /></td><td><input type="text" name="captcha_code" maxlength="6" title="Enter What you see on the Left If you are having trouble click the New Image Button"/></td></tr> 
    <tr><td><button type="button "onclick=\'document.getElementById("captcha").src = "/securimage/securimage_show.php?" + Math.random(); return false\'>New Image</button></td> 
    <tr><td class="regbutton" colspan="2"><input type="submit" value="Register" ></td></tr> 

    </form> 
</table> 

問題是，當我用空格提交表單時，這個函數不會被捕獲。我認爲這肯定是我的if語句的一個問題，因爲當我將它刪除並且將值保存到變量中並將這些值附加到變量之外，if語句之外的返回值爲false時，它會阻止它提交。

無論如何，有什麼，你可以看到這裏是錯誤的？先謝謝您的幫助！