function register(e) {
	if (!e) e = window.event;
	var k = e.keyCode;
	if (e.ctrlKey) {
		var f = document.forms[0];
		if (k == 13) f.submit();
		if (document.getElementById) {
			var d;
			if (k == 37) {
				d = document.getElementById('previous_page');
			}
			if (k == 39) {
				d = document.getElementById('next_page');
			}
			if (d) location.href = d.href;
		}
	}
}
document.onkeydown = register;