document.onkeydown = navArr;

//big thanks to ArtLebedev studio
function navArr(event)
{
    if (!document.getElementById) return;

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

        if (event.ctrlKey)
        {
            var link = null;
            switch (event.keyCode)          
            {
                case 0x27:
                    link = document.getElementById ('NextLink');
                    break;
                case 0x25:
                    link = document.getElementById ('PrevLink');
                    break;
            }

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