function show2007()
		{
		document.getElementById("2007-main").style.display= "block";
		document.getElementById("2008-main").style.display= "none";
		document.getElementById("2006-main").style.display= "none";
		document.getElementById("2005-main").style.display= "none";
		}
		
		function show2008()
		{
		document.getElementById("2008-main").style.display= "block";
		document.getElementById("2007-main").style.display= "none";
		document.getElementById("2006-main").style.display= "none";
		document.getElementById("2005-main").style.display= "none";
		}
		
		function show2006()
		{
		document.getElementById("2006-main").style.display= "block";
		document.getElementById("2005-main").style.display= "none";
		document.getElementById("2007-main").style.display= "none";
		document.getElementById("2008-main").style.display= "none";
		}
		
		function show2005()
		{
		document.getElementById("2005-main").style.display= "block";
		document.getElementById("2006-main").style.display= "none";
		document.getElementById("2007-main").style.display= "none";
		document.getElementById("2008-main").style.display= "none";
		}