var article = 0;
function getArticle(w) {
   if (w == 0) var next = article-1;
   else var next = article+1;
   
   if (document.getElementById('article['+article+']') && document.getElementById('article['+next+']')) { 
      document.getElementById('article['+article+']').style.display = 'none';
      document.getElementById('article['+next+']').style.display = 'block';
      if (next > article) document.getElementById('getArticle1').className='l1_2';
      else document.getElementById('getArticle2').className='l2_2';
      article = next;
   }
   if (w == 1) {
      if (!document.getElementById('article['+(article+1)+']')) document.getElementById('getArticle2').className='l2_1';
   } else {
      if (!document.getElementById('article['+(article-1)+']')) document.getElementById('getArticle1').className='l1_1';
   }
   
}