<!--
// visi and blocking functions from http://www.xs4all.nl/~ppk/js/blockinvi.html
// http://www.xs4all.nl/~ppk/js/display.html is useful as well

function visi(nr)
{
	if (document.layers)
	{
		vista = (document.layers[nr].visibility == 'hide') ? 'show' : 'hide'
		document.layers[nr].visibility = vista;
	}
	else if (document.all)
	{
		vista = (document.all[nr].style.visibility == 'hidden') ? 'visible'	: 'hidden';
		document.all[nr].style.visibility = vista;
	}
	else if (document.getElementById)
	{
		vista = (document.getElementById(nr).style.visibility == 'hidden') ? 'visible' : 'hidden';
		document.getElementById(nr).style.visibility = vista;

	}
}

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

function show(nr)
{

// First, all divs are hidden
// The correct div is then shown

	if (document.layers)
	{
		for (var i=1;i<3;i++) {
			document.layers['number' + i].display = 'none';
		}
		document.layers[nr].display = 'block';
	}
	else if (document.all)
	{
		for (var i=1;i<3;i++) {
			document.all['number' + i].style.display = 'none';
		}
		document.all[nr].style.display = 'block';

	}
	else if (document.getElementById)
	{
		for (var i=1;i<3;i++) {
			document.getElementById('number' + i).style.display = 'none';
		}
		document.getElementById(nr).style.display = 'block';
	}
}

function show(nr,num_of_tabs)
{
// First, all divs are hidden
// The correct div is then shown

	if (document.layers)
	{
		for (var i=1;i<num_of_tabs+1;i++) {
			document.layers['number' + i].display = 'none';
		}
		document.layers[nr].display = 'block';
	}
	else if (document.all)
	{
		for (var i=1;i<num_of_tabs+1;i++) {
			document.all['number' + i].style.display = 'none';
		}
		document.all[nr].style.display = 'block';

	}
	else if (document.getElementById)
	{
		for (var i=1;i<num_of_tabs+1;i++) {
			document.getElementById('number' + i).style.display = 'none';
		}
		document.getElementById(nr).style.display = 'block';
	}
}
// -->