<script type="text/javascript">
<!--
var url_preview = "{?$url_preview?}";
var url_next = "{?$url_next?}";
var url_index = "{?$url_index?}";
var articleid = "{?$articleid?}";
var chapterid = "{?$chapterid?}";

function jumpPage() {
var event = document.all ? window.event : arguments[0];
if (event.keyCode == 37) location = url_preview;
if (event.keyCode == 39) location = url_next;
if (event.keyCode == 13) location = url_index;
}
document.onkeydown=jumpPage;
-->
</script>