javascript hide div
// javascript
<script>
document.getElementById("id").style.display = "none"; //hide
document.getElementById("id").style.display = "block"; //show
document.getElementById("id").style.display = ""; //show
</script>
// html
<html>
<div id="id" style="display:none">
<div id="id" style="display:block">
</html>
// jquery
<script>
$("#id").hide();
$("#id").show();
</script>