Download the FireBug ADDON for FireFox, open it up, click the little down-arrow next to "Console" and enable a few of those logs.
Now, go to your site and see if there are any immediate errors in the console. If not, start sifting through the HTML and SCRIPT tabs to see if there is any external code being added on the page-load. You can "watch" and "step into" sections of your site as the page loads by setting a break point in FireBug.
You should also go through and check your files and folder's permissions on your servers to make sure they aren't allowing writes access where it shouldn't be. Sometimes Wordpress plugins need certain permissions and people do a quick permission change to 777 for instance and leave it open.
As it stands now, your comments aren't giving us much to go on to help you.
