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Multi select Dropdown with filter

I have a requirement where in I have to create a multi select drop down where the elements can be searchable and the count of selected items should be displayed upon selection.
I have found the partial part of the requirements at this link
But not sure how to make the drop down collapsible and expandable
Wire frame image as below
Has anyone come across and worked on such requirements?

Well it depends also a bit if you are using plain Javascript or if you are also using a Framework like Angular/vue/ember or so
here is one component that looks like it makes what you want
http://selectize.github.io/selectize.js/

Multiple selection in Bootstrap typeahead

I'm looking for a proper way to implement the jquery mobile filter list in bootstrap typeahead component.
The functionality that I needed is here in the following link. Please scroll down to the bottom. http://jquerymobile.com/demos/1.2.1/docs/lists/lists-inset.html
In the filtering list, I want to add checkboxes for each list items and the user should be able to check multiple value. They don't have to be added to the textfield. As that's the only function I need, its no use of adding the whole jquery mobile library to the project.
I found couple of options in the following link which goes near my requirement.
http://fusiongrokker.com/post/heavily-customizing-a-bootstrap-typeahead
But, the multiple selection by clicking checkboxes didn't work with bootstrap typeahead.
Can anyone give me a good solution for this.
Thanks

If you looking for bootstrap, this plugin can be used in your project
https://sliptree.github.io/bootstrap-tokenfield/

I saw following has been suggested in many places:
http://ivaynberg.github.io/select2/
(If you use the multi-value version.)

Style / Replace a select box using prototype / scriptactulous

I'm trying to style my select box, I assume I need some type of javascript method.
I'm using rails - and sticking with prototype/scriptactulous.
Does anyone know of any solutions?
EDIT:
CSS doesn't do nearly what I'm trying to accomplish:
alt text http://img16.imageshack.us/img16/1373/dropdownk.png

I wrote a prototype select box control today. It allows styling everything- the select input box, the button, the dropdown box(where options are shown), the scrollbar and its buttons, the options, adding images to options. The class can replace select inputs automatically just by calling the script if select controls have class="replacemeselect" or be called manually. There are a bunch of customization options and you can have multiple styles of selects on a page if you need it. Unlike IPS this class handles keyboard events and has a scrollbar.
You may look at the demo: http://awsumlabs.com/selectreplace and use the library if you like it.

For styling select boxes you actually need js. In CSS you can style everything, but the button. The problem is that the button is os dependent and is not controlled by the browser. So maybe the man asks the right question. I'm searching for a protoype/script.aculo.us solution too. I use these frameworks and I don't want to change to mootools ot jquery.
In fact I found an interesting prototype project- IPS. http://yura.thinkweb2.com/playground/in-place-select/
There are also select multiple controls(I need select for one element only now so maybe I'll stick to ips). livepipe.net/control/selectmultiple is one of them.

is there Any Dropdown <select> contains checkboxes?

I need a dropdown menu <select> which contains multiple checkboxes.
so people can drop down and select many options (all the checkboxes should be inside the dropdown)
Sometimes this is called a combobox (just to make everyone understands what I'm looking for)
I want this with javascript/css & not java applet or flash.

I think this is the thing you're describing - http://code.google.com/p/dropdown-check-list/

How to put an image/icon before select option text?

Looking to place different icons in front of items/options in a HTML select box.

In theory, you could make use of the CSS background-image property in the <option> element, but that doesn't work flawlessly in (cough) IE.
Best what you can do is to use jQuery/Javascript to mimic a dropdown with a bunch of <li> or <div> elements. As far no one comes to mind (I've never had the need for such a dropdown), but you can find here an overview of the "better" jQuery dropdown plugins, there must be one which suits your needs, for example this one.

The only way to do it would be to dynamically replace the select with a DHTML dropdown, the vanilla control doesn't have that capability. Using a DHTML dropdown has the benefit that it should degrade gracefully for those with javascript disabled.
You could do it quite simply with jQuery, have your normal <select>, grab it and replace with a hidden field, have your fancy DHTML dropdown with images (hidden positioned <div> with an unordered list could do it), attach to the onclick event of the items and make that update the hidden field with the selected value.