function toogleVisible(div_id)
{
	if (document.layers)
	{
		current = (document.layers[div_id].display == 'none') ? 'block' : 'none';
		document.layers[div_id].display = current;
	}
	else if (document.all)
	{
		current = (document.all[div_id].style.display == 'none') ? 'block' : 'none';
		document.all[div_id].style.display = current;
	}
	else if (document.getElementById)
	{
		vista = (document.getElementById(div_id).style.display == 'none') ? 'block' : 'none';
		document.getElementById(div_id).style.display = vista;
	}
}

function show(div_id)
{
	if (document.layers)
	{
		document.layers[div_id].display = "block";
	}
	else if (document.all)
	{
		document.all[div_id].style.display = "block";
	}
	else if (document.getElementById)
	{
		document.getElementById(div_id).style.display = "block";
	}
}

function hide(div_id)
{
	if (document.layers)
	{
		document.layers[div_id].display = "none";
	}
	else if (document.all)
	{
		document.all[div_id].style.display = "none";
	}
	else if (document.getElementById)
	{
		document.getElementById(div_id).style.display = "none";
	}
}

function selectTab(tab_articolo_)
{
	hide(tabs_group + tab_selected);
	tab_selected = tab_articolo_;
	show(tabs_group + tab_selected);

}