document.onkeydown = chang_page;
function chang_page(event) {
var event = event ? event : (window.event ? window.event : null);
var key = event.keyCode || event.which;
if (key == 37 || key == 33)
location = '';
if (key == 39 || key == 34)
location = '';
}
兼容IE，google，firefox的键盘上一张下一张
