Creating multi-select Dropdown Checkbox-list

I’m trying to create a Dropdown Checkbox-list which is very similar to this example.

Please, pay attention to the “Tags” section of Search Articles

[url]http://www.codeproject.com/info/search.aspx[/url]

Additional to above features, I want to add an option “[COLOR=”Magenta”]firstItemChecksAll[/COLOR]” for each group i.e. select “[COLOR=”magenta”]All[/COLOR]” for “Language, Platform, Technology, Audience…” etc.

If anyone have seen similar working examples on any websites or know how to code such Dropdown check-list using JavaScript/jQuery or even tutorials to recommend please let me know.

Thanks

p.s. I am aware of

[url]http://code.google.com/p/dropdown-check-list/[/url]
[url]http://www.givainc.com/labs/mcdropdown_jquery_plugin.htm[/url]
[url]http://easylistbox.com/demoMultiDropDown.aspx?rl=mf[/url]

but none of them fits what I want exactly so …..

Also in #JavaScript _↴