var global_cat = 0;
var global_art = 0;
var count_art = 0;

var slideshowInterval;
var slideshowTime = 3000;

function selectSection(id_cat)
{
	$$('div.cat_list_entry a').set('class', '');	
	$('cat_list_entry_'+id_cat).set('class', 'cat_list_entry_a');		
	
	$$('div.art_list div.cat_list_entry').setStyle('display', 'none');
	$('cat_list_'+id_cat).setStyle('display', '');
	
	global_cat = id_cat;
	global_art = 0;	
	count_art = $$('div#cat_list_'+id_cat+' div.art_list_entry').length;
	
	//selectArticleNext.periodical(10000);
	sectionInterval();
}

function selectArticleNext()
{
	global_art++;
	
	if (global_art >= count_art) 
		global_art = 0;

	$$('div#cat_list_'+global_cat+' div.art_list_entry').setStyle('display', 'none');
	$('art_list_'+global_cat+'_'+global_art).setStyle('display', '');
}

function selectArticlePrev()
{
	global_art--;
	
	if (global_art < 0) 
		global_art = count_art-1;

	$$('div#cat_list_'+global_cat+' div.art_list_entry').setStyle('display', 'none');
	$('art_list_'+global_cat+'_'+global_art).setStyle('display', '');
}

function sectionInterval(){
	if( !isNaN(slideshowInterval) ) clearInterval( slideshowInterval );
	slideshowInterval = setInterval( selectArticleNext, slideshowTime );
}

function makeButton(class_name){
	
	isIE=document.all;
	if( isIE ) return;
	
    var miniesFx = new Array();
    $$(class_name).each(function(element,i){
        miniesFx[i] = new Fx.Tween(element, {
            duration:200,
            wait:false
        });

        element.addEvent('mouseenter', function(){
            miniesFx[i].start('opacity', 1, 0.5);
        });

        element.addEvent('mouseleave', function(){
            miniesFx[i].start('opacity', 0.5, 1);
        });
    });
}