function switchto(elem)
{
	document.getElementById('about').style.display = document.getElementById('genealogy').style.display = document.getElementById('photo').style.display = document.getElementById('blog').style.display = 'none';
	document.getElementById(elem).style.display = 'inline';
	if (elem == 'about')
	{
		triangle_margin = '10px 54px 0 0';
	}
	else if (elem == 'genealogy')
	{
		triangle_margin = '10px 174px 0 0';
	}
	else if (elem == 'photo')
	{
		triangle_margin = '10px 330px 0 0';
	}
	else if (elem == 'blog')
	{
		triangle_margin = '10px 470px 0 0';
	}	
	else
	{
		triangle_margin = '10px 54px 0 0';
	}
	document.getElementById('triangle').style.margin = triangle_margin;
}