function NavigateThrough(evt) {
	if (!document.getElementById) return;
	if (!evt && window.event) evt = window.event;

	if (evt.ctrlKey) {
		var eLink = null;
		var iKeyCode = (evt.keyCode)? evt.keyCode : (evt.which)? evt.which : null;
		if (iKeyCode) switch (iKeyCode) {
			case 0x25:
				eLink = document.getElementById('PrevLink');
				break;
			case 0x27:
				eLink = document.getElementById('NextLink');
				break;
		}
		if (eLink && eLink.href) {
			if (evt.preventDefault) evt.preventDefault();
			document.location.href = eLink.href;
		}
	}
}

document.onkeydown = NavigateThrough;