[jQuery] dialog box

Hi!

I´m trying to make a dialog box , where you can press ok or cancel.
How do i set the function so that when a user press ok it returns
true? I'm new to javascript an jQuery so bare with me but this is what
i got so far...

function dialogBox(type,blockUi,heading,message) {
        var result;
        var signImg;
        var buttons;
        var ok = '<div><input type="button" id="okBtn" value="Ok" /></div>';
        var cancel = '<div><input type="button" id="cancelBtn"
value="Cancel" /></div>';

    //warning dialogbox
        if (type == 'warning' || type == '') {
                signImg='_img/signs/warning.png';
                buttons = ok + cancel;
        }
    //Info dialogbox
        else if (type == 'info') {
                signImg = '_img/signs/info.png';
                buttons = ok;
        }
    //Fatal dialogbox
        else {
                signImg = '_img/signs/error.png';
                buttons = ok;
        }
    //Create dialogbox
        function dialogBoxCreation() {
        $('<div id="dialogBox"><img src="'+signImg+'" alt="sign" /
><h3>' + heading + '</h3><p>'+message+'</p>'+buttons+'</div>')
        .appendTo('body')
        .center()
        .hide()
        .fadeIn();
    }
    dialogBoxCreation();
    //BlockUi
        if (blockUi=='yes') {
                $('<div id="dialogBg"></div>').height($('body').height()).width
('100%').css({
            'position': 'absolute',
            'background': '#000',
            'opacity': '0.6',
            'z-index': '1'
        }).prependTo('body').fadeIn();
        }
    $('#okBtn').click(function() {
               $('#dialogBox,#dialogBg').fadeOut(function() {
                   $('#dialogBox').remove();
                   $('#dialogBg').remove();
                });
        });
        $('#noBtn').click(function() {
                $('#dialogBox,#dialogBg').fadeOut(function() {
                     $('#dialogBox').remove();
                     $('#dialogBg').remove();
                 });
        });
}

Thanks in advance

George