I am using the following code to open and close a div ( slide up/down ) using js
I have the slide down event attached to a button and the slide up event sttached to
try this. it allows multiple items so isn't ID specific. and supports any content loaded via AJAX as well. jsfiddle is here
<div class='toggle_parent'>
  <div class='toggleHolder'>
    <span class='toggler'>Open</span>
    <span class-'toggler' style='display:none;'>Close</span>
  </div>
  <div class='toggled_content' style='display:none;'>
      My Content
  </div>
</div>
and
$('.toggler').live('click',function(){
  $(this).parent().children().toggle();  //swaps the display:none between the two spans
  $(this).parent().parent().find('.toggled_content').slideToggle();  //swap the display of the main content with slide action
});
                                                                        You can just use slideToggle() in the click function:
$('.grabPromo').click(function(e){
    $('.slideDown').slideToggle();
});
Here's a demo.
<div id="content">
bla bla bla bla bla bla bla bla blabla bla blabla bla bla
</div>
<input type="button" id="myButton" value="Slide down ↓"/>
$("#myButton").toggle(function(){
    $("#content").slideDown();
    $(this).val("Slide up ↑");
},function(){
    $("#content").slideUp();
    $(this).val("Slide down ↓")
});
Online demo: http://jsfiddle.net/amosrivera/AYWku/
Demo with span: http://jsfiddle.net/amosrivera/AYWku/1/