var page_state = 0;

function showSocialMediaNextPage()
{
  if( page_state == 0 )
  {
    $('#bookmarks-table').animate({left: '-=300'}, 500);
    page_state = 1;
  }
}

function showSocialMediaPreviousPage()
{
  if( page_state == 1 )
  {
    $('#bookmarks-table').animate({left: '+=300'}, 500);
    page_state = 0;
  }
}