function hide_div(id) {
	var article = document.getElementById('' + id);
	
	if(article.style.display == 'none') {
		article.style.display = 'block';				
		//button.src = 'static/images/collapse.gif';
		}
	else {
		article.style.display = 'none';
		//button.src = 'static/images/expand.gif';
		}
}