@amit: Thanks for the assist ??
@rkovachev:
I didn’t see what you mentioned, but I DID notice lots of errors in the javascript console that could be caused by lots of different things, including the fact that your site iappears to be loading jQuery, Prototype AND Scriptalicious; doing so usually isn’t necessary. In particular, though, I noticed that there was a 504 gateway error when trying to load this file:
https://dl.dropboxusercontent.com/u/[redacted number]/advertising/market_640x60.gif
This may have been an attempt to load an ad banner as you mentioned, but it failed. I do not know why you this is happening, but I suspect that your site has been compromised, because loading an image from a URL like that does not seem like normal ad-network behaviour.
I then ran your site through Sucuri’s scanner here:
https://sitecheck2.sucuri.net/results/bike-bg.com/
and it says that your site has been blacklisted by McAfee:
https://www.siteadvisor.com/sites/bike-bg.com
There is little detail available though. Still, based on what I saw, I think it’s a distinct possibility that your site was compromised.
So with that in mind, have a look here for what to do next:
https://codex.www.ads-software.com/FAQ_My_site_was_hacked