Please tell me why the following html does not call the javascript submit_click() function.
Code:
<!DOCTYPE html>
<html>
    <head>
    <title>Page Title</title>
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <link rel="stylesheet" type="text/css" href="style/style.css"/>
    <script language="JavaScript" type="text/javascript" src="js/Diva.js"></script>
    <style type="text/css">a {text-decoration: none}</style>
    <script language=javascript>
    function submit_click()
        {
        alert("Button Pressed");
        progExe("logon.php?"uname="+uname+"&Passwrd="+passwrd);
        }
    </script>
    </head>

    <body>
<!--- <form name="logon" ID="logon" action="logon.php" method="post"> -->
<table align="center" border="3" cellspacing="0" cellpadding="3">
<tr><td>Username:</td><td>
<input type="text" name="uname" id=uname maxlength="40" placeholder="Enter your UserName" autofocus required>
</td></tr>
<tr><td>Password:</td>
<td>
<input type="password" name="passwrd" id=passwrd maxlength="50" placeholder="Password" required>
</td></tr>
<tr><td colspan="3" align="center">
<button type="button" onclick="submit_click()">Logon</button>
<a href="register.html"><input type=submit value="RegisterSelf">
<a href="client.html"><input type=submit value="RegisterClient">
</td></tr>
</table>
<center>
<div id="loadingNode";></div>
</center>
</body>
</html>