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('NextLink'); break;
case 0x27: 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;
}
}