<script type="text/javascript">
        function check_form_data(){
            var url = document.getElementById("site_url").value;
            var username = document.getElementById("site_username").value;
            var password = document.getElementById("site_password").value;
            var message = "";
            if(url==""){
                message = "Please fill URL. <br />";
                document.getElementById("msg_url").innerHTML = message;
                return false;
            }
            elseif(username==""){
                message = "Please fill Username. <br />";
                document.getElementById("msg_user").innerHTML = message;
                message = "";
                return false;
            }
            elseif(password==""){
                message = "Please fill Password. <br />";
                document.getElementById("msg_pass").innerHTML = message;
                message = "";
                return false;
            }
            else return true;
        }
    </script>
    <form action="" method="POST">
        <input type="hidden" name="action" value="install" />
        <table border="1" align="center" style="border:medium #000">
            <tr>
                <td><strong>Site URL:<div id="msg_url" style="color:red"></div></strong></td>
                <td><input type="text" name="site_url" id="site_url" value="" /></td>
            </tr>
            <tr>
                <td><strong>Username:<div id="msg_user" style="color:red"></div></strong></td>
                <td><input type="text" name="site_username" id="site_username" value="" /></td>
            </tr>
            <tr>
                <td><strong>Password:<div id="msg_pass" style="color:red"></div></strong></td>
                <td><input type="password" name="site_password" id="site_password" value="" /></td>
            </tr>