document.onkeydown = register;
function register(e) 
	{
	if (!e) e = window.event;
	var k = e.keyCode;
	
	
	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;
		}
}