function showSister(sisterName)
{
	hideAllSisters();
	document.getElementById(sisterName).style.display = '';
}
function hideAllSisters()
{
	var content = document.getElementById("content");
	var sisters = content.getElementsByTagName("div");

	for (var i = 0; i < sisters.length; i++)
	{
		sisters[i].style.display = "none";
	}
}