// preload images onload 
	var oldonload = window.onload;
	if (typeof window.onload != "function")
	{
		window.onload = preloadPapers;
	}
	else
	{
		window.onload = function ()
		{
			oldonload();
			preloadPapers();
		}
	}


	// preload papers
	function preloadPapers()
	{
		image1 = new Image();
		image1.src = "images/paper03b01.jpg";
		image2 = new Image();
		image2.src = "images/paper03b02.jpg";
		image3 = new Image();
		image3.src = "images/paper03b03.jpg";
	}


	// show specified paper
	function showPaper(index)
	{
		document.getElementById("paper03b").src = "images/paper03b" + index + ".jpg";
		document.getElementById("paper03b").style.display = "block";
	}


	// hide specified paper
	function hidePaper(index)
	{
		document.getElementById("paper03b").style.display = "none";
	}