*I read your requirement .and you need need to make simple navigation bar with login/log out and sign up . so i will deliver it . because i had done more project on the PHP . correct me if any problem at my understanding about the scope.
*We have already worked about this skilled Joomla , Php , Open cart , Wordpress , Drupal , Javascript , cake Php , Smarty , Os commerce , theme integretion ,eCommerce related, Api related , Shopping cart related and many other things related..
*You don't need me pay me anything advance . just create milestone and after delivery of the code you can pay me
*Thanks