function visi_hide(nr)
{

	if (document.layers)
	{
		vista = 'hidden';
		document.layers[nr].visibility = vista;
	}
	else if (document.getElementById)
	{
		vista = 'hidden';		
		document.getElementById(nr).style.visibility = vista;
	}
	else if (document.all)
	{

		vista = 'hidden';
		document.all[nr].style.visibility = vista;
	}
}

function visi_show(nr)
{

	if (document.layers)
	{
		vista = 'visible';
		document.layers[nr].visibility = vista;
	}
	else if (document.getElementById)
	{
		vista = 'visible';		
		document.getElementById(nr).style.visibility = vista;
	}
	else if (document.all)
	{

		vista = 'visible';
		document.all[nr].style.visibility = vista;
	}

}




function visi(nr)
{

	if (document.layers)
	{
		if (document.layers[nr].visibility == ''
			|| document.layers[nr].visibility == 'hidden')
			vista = 'visible'
		else
			vista = 'hidden';

		document.layers[nr].visibility = vista;
	}
	else if (document.getElementById)
	{
		if (document.getElementById(nr).style.visibility == ''
			|| document.getElementById(nr).style.visibility == 'hidden')
			vista = 'visible'
		else
			vista = 'hidden';
			
		document.getElementById(nr).style.visibility = vista;
	}
	else if (document.all)
	{

		if (document.all[nr].style.visibility == ''
			|| document.all[nr].style.visibility == 'hidden')
			vista = 'visible'
		else
			vista = 'hidden';

		document.all[nr].style.visibility = vista;
	}

}

function blocking(nr)
{

	if (document.layers)
	{
		if (document.layers[nr].display == ''
			|| document.layers[nr].display == 'none')
			current = 'block'
		else
			current = 'none';

		document.layers[nr].display = current;
	}
	else if (document.getElementById)
	{
		if (document.getElementById(nr).style.display == ''
			|| document.getElementById(nr).style.display == 'none')
			vista = 'block'
		else
			vista = 'none';
	
		document.getElementById(nr).style.display = vista;
	}
	else if (document.all)
	{

		if (document.all[nr].style.display == ''
			|| document.all[nr].style.display == 'none')
			current = 'block'
		else
			current = 'none';

		document.all[nr].style.display = current;
	}

}