function NavigateThrough (event) {
	if (!document.getElementById) return;

	if (window.event) event = window.event;

	if (!event.ctrlKey) return;

	switch (event.keyCode ? event.keyCode : event.which ? event.which : null)
	{
		case 0x25:
			link = document.getElementById ('PrevLink');
			break;
		case 0x27:
			link = document.getElementById ('NextLink');
			break;
	}
	if (typeof link != 'undefined') document.location = link.href;	
}
document.onkeydown = NavigateThrough;
function addNavigation() {
	var prevLink = document.getElementById('PrevLink');
	var nextLink = document.getElementById('NextLink');
	var text;
	document.write('<div align="center">');
	var homeLink = document.getElementById('HomeLink');
	if (homeLink && homeLink.href)
	{
		text = homeLink.title ? homeLink.title : 'Home';
		document.write('<a href="'+homeLink.href+'">'+text+'</a><br>');
	}
	if (prevLink && prevLink.href)
	{
		text = prevLink.title ? prevLink.title : '&larr;';
		document.write('<a href="'+prevLink.href+'">'+text+'</a>');
	} else {
		document.write('&larr;');
	}
	document.write('<span style="margin:20px">Ctrl</span>');
	if (nextLink && nextLink.href)
	{
		text = nextLink.title ? nextLink.title : '&rarr;';
		document.write('<a href="'+nextLink.href+'">'+text+'</a>');
	} else {
		document.write('&rarr;');
	}
	document.write('</div><br/>');
}