document.onkeydown = kd;
function kd(e) {
if (!e) e = window.event;
var k = e.keyCode;
if (e.ctrlKey) {
	if (k == 37) {
		d = document.getElementById("prev_page");
	}
	if (k == 39) {
		d = document.getElementById("next_page");
	}
	if (d) location.href = d.href;
}
}