function blocking(nr,wtd)
{
	if (document.layers)
	{
		current = (document.layers[nr].display == 'none') ? 'block' : 'none';
		document.layers[nr].display = wtd;
	}
	else if (document.all)
	{
		//current = (document.all[nr].style.display == 'none') ? 'block' : 'none';
		document.all[nr].style.display = wtd;
	}
	else if (document.getElementById)
	{
		//vista = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		document.getElementById(nr).style.display = wtd;
	}
}