function articoli() {
	for(var i = 0, divs = document.getElementById('ultimi_articoli').getElementsByTagName('DIV'), j = divs.length; i < j; i++) {
		divs[i].onmouseover = function(){this.className += "_down";};
		divs[i].onmouseout = function(){this.className = this.className.substr(0, this.className.indexOf("_down"));};
	};
};