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 0x27:
		link = document.getElementById ('NextLink');
		break;
	    case 0x25:
		link = document.getElementById ('PrevLink');
		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;
    }			
}