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Java script function not called
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <title>Login Page</title>
    </head>
    <br><br><br><br>
    <body style="background-color: cornflowerblue" >
        <form action="Login" method="post" name="frmLogin">
            <table style="background-color: darkgrey" align="center" border="1">
                <thead>
                    <tr>
                        <th colspan="2" style="font-size: xx-large;color:darkmagenta" >Login Details</th>
                    </tr>
                </thead>
                <tbody>
                    <tr>
                        <td style="font-weight: bold" >Username</td>
                        <td><input type="text" name="txtUsername" value="" /></td>
                    </tr>
                    <tr>
                        <td style="font-weight: bold">Password</td>
                        <td><input type="password" name="txtPassword" value="" /></td>
                    </tr>
                    <tr>
                        <td align="center" colspan="2" >
                            <input type="button" onclick="return reset();" value="Reset" name="btnReset" />
                            <input type="submit" onclick="return submit();" value="Submit" name="btnSubmit" />
                        </td>
                    </tr>
                </tbody>
            </table>

        <script type="text/javascript"  language="javascript">
            function submit()
            {

                var username=frmlogin.document.txtUsername.vlaue;
                var password=frmlogin.document.txtPassword.vlaue;
                if(username=="")
                {
                    alert("Username Must be filled");
                    return false;
                }
                if(password=="")
                {
                    alert("Password Must be filled");
                    return false;
                }
                return true;
            }
            function reset()
            {
                frmlogin.document.txtUsername.vlaue="";
                frmlogin.document.txtPassword.vlaue="";
                return false;
            }
        </script>
        </form>
    </body>
</html>

onclick="return validate();"

function validate() {
    // ...
}

var username=frmlogin.document.txtUsername.vlaue;

<form action="Login" method="post" name="frmLogin" onsubmit="return submit();">

..if fails conditions..
 e.preventDefault();