function showTab ( num, othertab )
{
		i = num;
		if (  document.getElementById ("tab"+i).style.display !="block")
		{
			document.getElementById ("tab"+i).style.display = "block";
			document.getElementById ("img"+i).src = "images/minus.jpg";
		}
		else
		{
			document.getElementById ("tab"+i).style.display = "none";
			document.getElementById ("img"+i).src = "images/plus.jpg";	
		}
}