Mutating code!!

[Welsh cake]

Why would this file that exists on my server and only I have access to...
...Suddenly and without any help from me, turn into this..

Code:

DPbBfs  <a href="http://jrxiihmawjrm.com/">jrxiihmawjrm</a>, [url=http://cmzsqilvjtqw.com/]cmzsqilvjtqw[/url], [link=http://jyowdcuweyje.com/]jyowdcuweyje[/link], http://oamsptprmgbq.com/

I did a google check on dpbbfs and found one other site with a comment in its guestbook that looked exactly the same

The only thing I've noticed out of the ordinary is that you're still using <script language="JavaScript">, there's no attribute "language" as it is now deprecated.

Its been outdated for a while now, said attributes were kept around for backward browser compatibility, but I rarely see them nowadays so I'm assuming they've been dropped together with some elements too. Not to mention the self-proclaimed Linux boffins I knew at college regarded it as poor coding practice.

Code:

</style>

<script type="text/javascript" src="customAlertBox.js"></script>
<script language="JavaScript">

<!--

...And it goes on for a while...

I would try just sticking with <script type="text/javascript"> and drop the second line to see if there's any improvement. :]