Question

i need to slide a div down and then up on an event, how can i do this in java script

Answer 1

Update
I created this demo for you 🙂

You can do that easily with slideToggle() function of JQuery:

<div id="hello">Hello World</div>
<a href="#" id="link">Toggle Div</a>

JQuery:

$(function(){
    $('#link').click(function(){
      $('#hello').slideToggle();
      return false;
    })
});