if(document.addEventListener)
	document.addEventListener('keydown',NavigateThrough,false);
else if(document.attachEvent)
	document.attachEvent('onkeydown',NavigateThrough);

function NavigateThrough(event)
{
	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('nav_prev');
				break;
			case 0x27:
				link=document.getElementById('nav_next');
				break;
		}
		if(link&&link.href)document.location=link.href;
		if(href)document.location = href;
	}
}