javascript - select box with multiple values turning on and off -

i've got select box in form multiple="multiple" switched on.

at moment can hold ctrl if want select multiple items, want option click like, , selected or deselected when clicked.

i guess kinda whole list of checkboxes, don't want them checkboxes, want them dropdown.

is possible? maybe jquery?

i think going checkboxes not bad way. check out http://jqueryui.com/button/#checkbox. can style buttons list display: block etc.