function showBlock (ID)
{	
	document.getElementById(ID).style.display = "block";
}	

function hideBlock(ID)
{
	document.getElementById(ID).style.display = "none";
}	

function toggleBlock(ID)
{	
	
	if (document.getElementById(ID).style.display == "none")
		showBlock (ID);
	else	hideBlock (ID);
	
}