function blocking(nr)
{
	var img_id = nr + '_i';
	
	if (document.layers)
	{
		current = (document.layers[nr].display == 'none') ? 'block' : 'none';
		document.layers[nr].display = current;
		document.layers[img_id].src = '/img/'+current+'.gif';
	}
	else if (document.all)
	{
		current = (document.all[nr].style.display == 'none') ? 'block' : 'none';
		document.all[nr].style.display = current;
		document.all[img_id].src = '/img/'+current+'.gif';
	}
	else if (document.getElementById)
	{
		current = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		document.getElementById(nr).style.display = current;
		document.getElementById(img_id).src = '/img/'+current+'.gif';
	}
}

function blocking_text(nr)
{
	dirtext_div = nr+'_dirtext';
	invtext_div = nr+'_invtext';
	
	if (document.layers)
	{
		current = (document.layers[nr].display == 'none') ? 'block' : 'none';
		current2 = (document.layers[nr].display == 'none') ? 'none' : 'block';
		document.layers[nr].display = current;
		document.layers[dirtext_div].display = current;
		document.layers[invtext_div].display = current2;
	}
	else if (document.all)
	{
		current = (document.all[nr].style.display == 'none') ? 'block' : 'none';
		current2 = (document.all[nr].style.display == 'none') ? 'none' : 'block';
		document.all[nr].style.display = current;
		document.all[dirtext_div].style.display = current;
		document.all[invtext_div].style.display = current2;
	}
	else if (document.getElementById)
	{
		current = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		current2 = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		document.getElementById(nr).style.display = current;
		document.getElementById(dirtext_div).style.display = current;
		document.getElementById(invtext_div).style.display = current2;
	}
}

function blocking_simple(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)
	{
		current = (document.getElementById(nr).style.display == 'none') ? 'block' : 'none';
		document.getElementById(nr).style.display = current;
	}
}