菜鸟询问登陆问题

我看一个网站登陆的源代码，但是找不到数据库连接的文件，是不是数据库是另外的配置文件的啊，那个是配置文件的语句呢
<html>
<head>
<title>登陆</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<link href="/prog/css/1.css" rel="stylesheet" type="text/css">
<style type="text/css">
<!--
.STYLE1 {font-size: 12px}
-->
</style>
</head>
<body bgcolor="#FFFFFF" leftmargin="0" topmargin="0" marginwidth="0" marginheight="0">
<p>
  <!-- ImageReady Slices (登陆.psd) -->
  <br>
</p>
<p>&nbsp;</p>
<table width="638" height="467" border="0" align="center" cellpadding="0" cellspacing="0" id="__01">
<tr>
<td>
<img src="/prog/images/login_01.jpg" width="638" height="236" alt=""></td>
</tr>
<tr>
  <td height="137" background="/prog/images/login_02.jpg">
  <table width="50%" border="0" align="right" cellpadding="0" cellspacing="0">
  
          <form name="form1" method="post" action="index.cgi" onSubmit="return checkinput(this)">
          <input type=hidden name=f value=login>
          <input type=hidden name=returl value="">
          <tr>
            <td width="20%" height="27" valign="middle" class="black3 STYLE1">用户名：</td>
            <td colspan="2" valign="middle">
              <input name="username" type="text" id="username" value="" size="18">
            </td>
            <td width="30%" rowspan="2"><input type="image" name=submit src="/prog/images/icon1.jpg" width="50" height="47"></td>
          </tr>
          <tr>
            <td height="28" valign="middle" class="black3 STYLE1">密&nbsp;&nbsp;&nbsp;&nbsp;码：</td>
            <td colspan="2" valign="middle">
              <input name="password" type="password" id="password" size="18">
            </td>
          </tr>
          <tr>
            <td valign="middle" class="black3 STYLE1">验证码：</td>
            <input type=hidden name=v_id value="3925486">
            <input type=hidden name=v_digest value="d98d80d006838bd59d18bff86b67a4e3">
            <td width="24%" valign="middle">
              <input name=v_secret class="form1ab" size=12 chname="&#39564;&#35777;&#30721;" maxsize="4" nullable="no" datatype="text" style="float: left;width:94;height:21px;">
            </td>
            <td width="28%" align="center" valign="middle"> <a href="javascript:chk_img();"><img id="chk_img" src="/prog/pic.cgi?color=000000&id=3925486&digest=d98d80d006838bd59d18bff86b67a4e3" align="left" border=0 alt="看不清楚数字吗？点击这里再试试。"></a></td>
            <td><a href="javascript:chk_img();" class="gray2">看不清？</a></td>
          </tr></form> 
        <script language="JavaScript">
<!--
    function chk_img(){
        var chk_img_time =new Date().getTime();
        document.getElementById('chk_img').src='/prog/pic.cgi?color=000000&id=3925486&digest=d98d80d006838bd59d18bff86b67a4e3' + '&' + chk_img_time;
    }
   
function checkinput(thisform)
{
  if(thisform.username.value=="") {
                thisform.username.focus();
                thisform.username.select();
                alert("请输入用户名!"); 
                return false;                            
          }   
          if(thisform.password.value=="") {
                thisform.password.focus();
                thisform.password.select();
                alert("请输入密码!"); 
                return false;                            
          }   
          if(thisform.v_secret.value.length != 4) {
                thisform.v_secret.focus();
                thisform.v_secret.select();
                alert("验证码错误!"); 
                return false;                            
          }     

  return true
} //-->
        </script>
        </table></td>
</tr>
<tr>
<td><img src="/prog/images/login_03.jpg" width="638" height="56" border="0" usemap="#Map"></td>
</tr>
</table>
<!-- End ImageReady Slices --><map name="Map"><area shape="rect" coords="110,12,206,51" href="http://china.chemnet.com/">
<area shape="rect" coords="214,11,216,12" href="#"><area shape="rect" coords="213,10,312,50" href="http://www.texnet.com.cn/">
<area shape="rect" coords="325,9,423,53" href="http://www.pharmnet.com.cn/">
<area shape="rect" coords="435,11,529,52" href="http://www.chemnet.com/">
<area shape="rect" coords="540,10,636,51" href="http://www.netsun.com/">
</map></body>
</html>