function showNavi1()
{
	document.getElementById('navigation').style.visibility = 'visible';
	document.getElementById('navigation2').style.visibility = 'hidden';
}

function showNavi2()
{
	document.getElementById('navigation2').style.visibility = 'visible';
	document.getElementById('navigation').style.visibility = 'hidden';
}

function ShowCode()
{
	document.getElementById('coderef').style.visibility = 'visible';
	HideReferences();
	HideContact();
	HideAbout();
	HideWeb();
	HideDemo();
	showNavi2();
}

function HideCode()
{
	document.getElementById('coderef').style.visibility = 'hidden';
}

function ShowDemo()
{
	document.getElementById('demoref').style.visibility = 'visible';
	HideReferences();
	HideContact();
	HideAbout();
	HideWeb();
	HideCode();
	showNavi2();
}

function HideDemo()
{
	document.getElementById('demoref').style.visibility = 'hidden';
}

function ShowWeb()
{
	document.getElementById('webref').style.visibility = 'visible';
	HideReferences();
	HideContact();
	HideAbout();
	HideCode();
	HideDemo();
	showNavi2();
}

function HideWeb()
{
	document.getElementById('webref').style.visibility = 'hidden';
}

function ShowAbout()
{
	document.getElementById('about').style.visibility = 'visible';
	HideReferences();
	HideContact();
	HideWeb();
	HideCode();
	HideDemo();
	showNavi1();
}

function ShowReferences()
{
	document.getElementById('references').style.visibility = 'visible';
	HideAbout();
	HideContact();
	HideWeb();
	HideCode();
	HideDemo();
	showNavi2();
}

function ShowContact()
{
	document.getElementById('contact').style.visibility = 'visible';
	HideReferences();
	HideAbout();
	HideWeb();
	HideCode();
	HideDemo();
	showNavi1();
}

function HideAbout()
{
	document.getElementById('about').style.visibility = 'hidden';
}

function HideReferences()
{
	document.getElementById('references').style.visibility = 'hidden';
}

function HideContact()
{
	document.getElementById('contact').style.visibility = 'hidden';
}

function externalLinks() {
 if (!document.getElementsByTagName) return;
 var anchors = document.getElementsByTagName("a");
 for (var i=0; i<anchors.length; i++) {
   var anchor = anchors[i];
   if (anchor.getAttribute("href") &&
       anchor.getAttribute("rel") == "external")
     anchor.target = "_blank";
 }
}
window.onload = externalLinks;