function changeDoc(index)
{
		document.getElementById("docdefault").style.visibility = 'hidden';
		if (document.getElementById("doc0"))
			document.getElementById("doc0").style.visibility = (index == 0 ? 'visible' : 'hidden');
		if (document.getElementById("doc1"))
			document.getElementById("doc1").style.visibility = (index == 1 ? 'visible' : 'hidden');
		if (document.getElementById("doc2"))
			document.getElementById("doc2").style.visibility = (index == 2 ? 'visible' : 'hidden');
		if (document.getElementById("doc3"))
			document.getElementById("doc3").style.visibility = (index == 3 ? 'visible' : 'hidden');
		if (document.getElementById("doc4"))
			document.getElementById("doc4").style.visibility = (index == 4 ? 'visible' : 'hidden');
		if (document.getElementById("doc5"))
			document.getElementById("doc5").style.visibility = (index == 5 ? 'visible' : 'hidden');
		if (document.getElementById("doc6"))
			document.getElementById("doc6").style.visibility = (index == 6 ? 'visible' : 'hidden');
}