accordion if/else logic

I'm guessing my if/else logic is skewed. Basically I have an accordion structure where, on page load, the first accordion pane is half-revealed to a height of 150px. Then when the user clicks on the accordion header it fully opens to a height of 320px. On the next click it should close and act normally like the other accordion elements with a standard hide/show. It currently works ok but its not smooth and the accordion pane closes before it fully reveals.

Here's the html:

<div class="accordion">
      <h3 class="acc-header glanceH">At a glance</h3>
      <div class="acc-content glanceC slider" >
        <div class="hero-video">
        </div>
      </div>
      <h3 class="acc-header">What we do</h3>
      <div class="acc-content" >
        <div class="hero-video what-we-do">
        </div>
      </div>
      <h3 class="acc-header">How we do it</h3>
      <div class="acc-content how" >
      </div>
      <h3 class="acc-header">Where we reach</h3>
      <div class="acc-content where" >
      </div>
      <h3 class="acc-header">How</h3>
      <div class="acc-content" >
      </div>
    </div>

Here's the jQuery:

//generally slides all accordion elements with class "acc-content" when div with class "acc-header" is clicked 

$('.acc-header').click(function(e) {
        e.preventDefault();
        $(this).toggleClass('acc-active');
        $(this).next('.acc-content').slideToggle(200).siblings('.acc-content').slideUp(200);
        $(this).siblings().removeClass('acc-active');       
    });

//when the page loads 'peek' at the content of the first accordion content (to 150px depth)

    $('.slider').css('height','150px');
    $('.slider').animate({ height: 'show'}, 'slow').addClass('itsopen');    

//if its already been opened, close it, else open it to 320px

    $('.glanceH').click(function() {
              if(!$(this).hasClass('acc-active')) {
                    $(this).next().siblings('.acc-content').slideUp(2000);
                    $(this).siblings().removeClass('acc-active');
                }
              else if($('.slider').hasClass('itsopen')){
                    $('.slider').animate({ height: 320}, 'slow');
                }
     });

Answers


Update: Oops, it would help if I read the question - Here is a demo :P

//generally slides all accordion elements with class "acc-content" when div with class "acc-header" is clicked
$('.accordion .acc-header').click(function() {
    var first = $('.slider');

    // open peek if clicked, otherwise hide it
    if (first.is('.itsopen')) {
        if ($(this).next().is('.acc-active')) {
            // open peek to full height
            first.removeClass('itsopen').animate({ height: '320px' }, 'slow');
            return;
        } else {
            // close first because a different header was clicked
            first.removeClass('itsopen acc-active').slideUp('slow');
        }
    }

    // remove active class from all content
    $('.acc-content').removeClass('acc-active');
    // show active content
    $(this).next().addClass('acc-active').toggle('slow');
    // close all content that isn't active
    $('.acc-content:not(.acc-active').slideUp('slow');
    return false;

})
// initialize accordion with all content closed
.next().hide();

//when the page loads 'peek' at the content of the first accordion content (to 150px depth)
$('.slider')
    .css({ height: '0px' })
    .show()
    .animate({ height: '150px' }, 'slow')
    .addClass('itsopen acc-active');

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