document.onkeydown = NavigateThrough;

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

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

	if (event.ctrlKey) {
		var link = null;
		var href = null;
		switch (event.keyCode ? event.keyCode : event.which ? event.which : null) {
			case 0x25: link = document.getElementById ('PrevLink');	break;
			case 0x27: link = document.getElementById ('NextLink');	break;
			case 0x26: link = document.getElementById ('UpLink');break;
			case 0x28: link = document.getElementById ('DownLink');	break;
			case 0x24:	href = '/';break;
		}

		if (link && link.href) document.location = link.href;
		if (href) document.location = href;
	}			
}