function switch_article(obj, content_block, avt) {
	atabs = ['atab_1', 'atab_2','atab_3','atab_4','atab_5','atab_6'];
	zmist = ['a_1', 'a_2','a_3','a_4','a_5','a_6'];	
	
	if(avt !== 1) {
	window.clearInterval(slider_id);
	current_tab = content_block - 1;
	}
	
	for(i=0; i<6; i++) {
		document.getElementById(atabs[i]).className = 'article_tab';
		document.getElementById(zmist[i]).style.display = 'none';
	}
	obj.className = 'activetab';
	document.getElementById('a_'+content_block).style.display = 'block';	
}

var slider_id;
current_tab = 0;
article_timer = 14000;

function article_slider() {
	atabs = ['atab_1', 'atab_2','atab_3','atab_4','atab_5','atab_6'];
	
	window.clearInterval(slider_id);
	slider_id = window.setTimeout(article_slider, article_timer);
	
	tab = document.getElementById(atabs[current_tab]);
	switch_article(tab, current_tab + 1, 1);
	
	if(current_tab < 5) {
		current_tab++;
	} else {
		current_tab = 0;
	}
}