var startAuthor;
var startPermlink;

function getDiscussions(start_author, start_permlink)
{
     start_author = typeof start_author !== 'undefined' ?  start_author : '';
     start_permlink = typeof start_permlink !== 'undefined' ?  start_permlink : '';
     if(start_permlink && start_author)
     {
         var params =
         {
             'limit': 100,
             'truncate_body': 240,
             'start_author': start_author,
             'start_permlink': start_permlink
         }
     }
     else
     {
         var params =
         {
             'limit': 100,
             'truncate_body': 240
         }
     }

     golos.api.getDiscussionsByCreated(params, function(err, data){
        if(data.length > 0)
        {
            data.forEach(function (operation){
                AddBlockX(operation);
            });
        }
     });
}

function AddBlockX(operation)
{
    ...
    startAuthor = operation.author;
    startPermlink = operation.permlink;
    ...

}