function showDiv(id){
	var articles = document.getElementsByTagName('DIV');
	for(var i=0;i<articles.length;i++){
		if(articles[i].className == 'tresc'){
			if(articles[i].id == id){
				articles[i].style.display = 'block';
			}else{
				articles[i].style.display = 'none';
			}	
		}
	}	
}