For your login page, I would say it has something to do with your Google Checkout. Reason being is the // EOF appears just before it starts and noticed you have an ending comment but no beginning one?
<!-- ** END GOOGLE CHECKOUT ** -->

Where is the;

<!-- ** START GOOGLE CHECKOUT ** -->


Also, seems you are using a Shared SSL Cert or one not Dedicated to your Domain name and/or IP address. This will cause Warnings to appear in every Browser... not good.