UPDATE: The initial question requested was clarified. However, the code revealed for those. So, I have modified my question below:

And So I possess the following dynamically produced html via php

<div class="image-link link-posttypes mainSelector1">
    <select id="wp_accordion_images[20110630022615][post_type]" name="wp_accordion_images[20110630022615][post_type]">
        <option value="">default</option>
        <option value="post" class="post-type">Post</option><option value="page" class="post-type">Page</option><option value="dp_menu_items" class="post-type">Menu Items</option>
        <option value="wps_employees" class="post-type">Employees</option><option value="custom-link">Custom Link</option>
    </select>
</div>

<div class="image-link link-pages1">
    <select id="wp_accordion_images[20110630022615][page_id]" name="wp_accordion_images[20110630022615][page_id]">
        <option value="50" class="level-0">About</option>
        <option value="65" class="level-0">Contact</option>
        <option value="2" class="level-0">Sample Page</option>
        <option value="60" class="level-0">Staff</option>
    </select>
</div>

<div class="image-link link-posts1">
    <select onchange="javascript:dropdown_post_js(this)" id="wp_accordion_images[20110630022615][post_id]" name="wp_accordion_images[20110630022615][post_id]">
        <option value="http://localhost/tomatopie/?p=1" class="level-0">Hello world!</option>
    </select>
</div>

<div class="image-link link-custom1">
    <input type="text" size="25" value="" name="wp_accordion_images[20110630022615][image_links_to]">
</div>

***It REPEATS four occasions: in which the #1 would go to 2..3...4 (max to 4 at this time around).

I be capable of label div .classes, choose #ids, and option classes. However, what I wish to have the ability to do is dependant on the choice selected from div .link-posttypes, I wish to reveal .link-pages (if page is chosen) or .link-posts (if publish is chosen) and .link-custom for those others (except the default).

In order written on screen there should simply be the first div, and when the consumer chooses a product, the right div seems.

I have not developed anything in jQuery or javascript. This really is my maiden voyage. Any assistance will be greatly appreciated!

***Also, this is loaded with an exterior js file.

Presuming that you are outputting proper IDs, that you can do something similar to this (note I changed the id):

  $(window).load(function(){
    // hide all the divs except the posttypes
    $('.image-link').not('.link-posttypes').hide();
    $('#wp_accordion_images_20110630022615_post_type').change(function() {
        var divSelector = '.link-' + $(this).val();
        $('.image-link').not('.link-posttypes').hide();
        $(divSelector).show();

    });
  });

Also, consider altering your options such as this:

<option value="posts" class="post-type">Post</option>
<option value="pages" class="post-type">Page</option>
<option value="menu_items" class="post-type">Menu Items</option>        
<option value="wps_employees" class="post-type">Employees</option>
<option value="custom">Custom Link</option>   

Here is a jsfiddle with this: http://jsfiddle.net/JrPeR/

There's my understandable jquery script

$(document).ready(function(){
    $(".link-pages").hide();
    $(".link-posts").hide();
    $(".link-custom").hide();
    $(".link-posttypes select").change(function(){
       var selectedVal = $(":selected",this).val();
       if(selectedVal=="post"){
            $(".link-pages").hide();
            $(".link-posts").show();
            $(".link-custom").hide();
       }else if(selectedVal=="page"){
            $(".link-pages").show();
            $(".link-posts").hide();
            $(".link-custom").hide();
       }else if(selectedVal!=""){
            $(".link-pages").hide();
            $(".link-posts").hide();
            $(".link-custom").show();
       }else{
            $(".link-pages").hide();
            $(".link-posts").hide();
            $(".link-custom").hide();
       }
    });
});

Demo here. Take me couple minute to help you clear to see. Have some fun.