After another look , I may be wrong .. looks like you may have been hacked ! open your site , and view the source code .. line 289 starts
Code:
<script>check_content()</script><script>check_content()</script><
A quick google shows this linked to an redirect / popup type hack.
I may be wrong , but email me or PM me and I have something that can protect you from this happening again . In the mean time I would download your entire site via FTP and check every file for the string starting <script>check_content()
Unless of course you know what that is . Its not just on that page its on every page so its on a file that gets included on every page like the footer or something like that.
Don't want to scare you but you need it sorted ASAP or customers will be disappearing.
Mark
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