function espandiStudioCategoriaDocumenti(id_categoria){
	if (document.getElementById("categoria_" + id_categoria + "_row").style.display == 'none'){
		document.getElementById("categoria_" + id_categoria + "_row").style.display = 'table-row';
		document.getElementById("button_" + id_categoria).style.background = "transparent url(/include/images/less.png) center 11px no-repeat";
	}else{
		document.getElementById("categoria_" + id_categoria + "_row").style.display = 'none';
		document.getElementById("button_" + id_categoria).style.background = "transparent url(/include/images/add.png) center 11px no-repeat";
	}
}