var currentcontentId;
var contentVisible = 'block';
var contentHidden = 'none';
  
function ShowContent(contentId)
{
	content = document.getElementById(contentId);
	
	content.style.display = contentVisible;

	currentcontentId = contentId;
}

function HideContent(contentId)
{
	content = document.getElementById(contentId);
	content.style.display = contentHidden; 
}

function hideCurrentcontent()
{
	if (currentcontentId)
	{
		currentcontent = document.getElementById(currentcontentId);
		currentcontent.style.display = contentHidden; 
	}
}