var sidebar_align = 'right';
var content_container_margin = parseInt('350px');
var sidebar_width = parseInt('330px');
I'm looking 4 a new host and see that some host provider charge a fee for a Reverse DNS, but Im not actually know what is that ? is that something make my domain invisible or something ?
No, it is primarily for mail servers, so that when a rDNS lookup is done it knows the proper domain, it is a method of matching an IP to a name, instead of a name to an IP.
Your web host should be able to add a reverse DNS entry for free, I think it's part of your webhosting plan/package. It is only a couple entries in DNS nothing major.