Wait for "return value" from Javascript modal

OK, I'm by no means a JavaScript guru, and perhaps I'm still thinking in terms of Desktop software development, but this is what I'm trying to achieve :

• I'm using Twitter Bootstrap's Modals
• In some cases, before an action takes place, I want to verify it with a "Are you sure?" (Yes/No) Modal Dialog.

Question :

• What should the inner logic be?

I mean :

• User clicks buttonA (which ultimately performs actionA)
• I want to launch the modal, wait for the input (either of the 2 buttons - yes/no) and/or pass it to some checking routine before performing(or not) actionA

This my HTML code for the modal (should the buttons be - somehow - acting via their onclick javascript routines?) - also note that #confirmMessage is going to be variable.

<div class="modal fade hide" id="confirmAlert">
    <div class="modal-header">
        <button type="button" class="close" data-dismiss="modal">x</button>
        <h3 id="confirmTitle">Are you sure?</h3>
    </div>

    <div class="modal-body">
        <p id="confirmMessage">Body</p>
    </div>
    <div class="modal-footer">
        <a href="#" class="btn" data-dismiss="modal">Cancel</a>
        <a href="#" class="btn btn-danger">Yes</a>
    </div>
</div>

Just an idea:

• Write a function like checkBeforeExec(message,functionToExec)
• Set #confirmMessage to message and Yes' href to javascript:functionToExec
• Makes sense?

I know it may sound a bit confusing - but I simply do not know what the most javascript-friendly way to do this would be...