For more information about Google analytics click on this link: http://www.google.es/intl/es/analytics/privacyoverview.html .
Furthermore you can prevent the record of the data provided by the cookie (belonging to Google), regarding the use of the website (your IP address included), as well as the data processing by Google , downloading and installing in your computer the available plugin of the browser, through the next link:http://tools.google.com/dlpage/gaoptout?hl=en
You can allow, block or delete the cookies installed on your computer, through the configuration options of the browser you have installed on it.
For more information about Firefox click on: http://support.mozilla.org/es/products/firefox/cookies
For more information about Chrome click on: http://support.google.com/chrome/bin/ answer.py?hl=es&answer=95647
For more information about Explorer click on:: http://windows.microsoft.com/es-es/ windows7/how-to-manage-cookies-in-internet-explorer-9
For more information about Safari click on: http://support.apple.com/kb/ph5042
For more information about Opera click on: http://help.opera.com/Windows/11.50/es-ES/cookies.html