function PopUpViewer (url, windowname, w, h)
{
	NewViewer = window.open(url, windowname,'width=' + w + ',height=' + h + ',scrollbars=yes,resizable=yes');
	NewViewer.opener.name = "opener";
	
	NewViewer.focus();
}

function toggleMenu(id) 
{
	var d = document.getElementById(id);
	for (var i = 1; i<=10; i++) 
	{
		if (document.getElementById('nav_menu'+i)) 
		{
			document.getElementById('nav_menu'+i).style.display='none';
		}
	}
	if (d) 
	{
		d.style.display='block';
	}
}