Java script Equivalent VB script MsgBox

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VBScript

Javascript

I have an old application, in which i am using VB script MsgBox. Now i am making the application Chrome compatible, in which VB script wont work, So i create a function below

function MsgBoxClass(header) {
this.returnvalue = 0;

this.modalalert = function msgBox() {
    var modalDiv = '<div id="dvModal" class="modal hide">' +
        '<div class="modal-header">' +
        '<table style="width:100%;">' +
        '<tr>' +
        '<td style="width:70%;text-align:left">' +
        '<h3 id="ModalHeader"></h3>' +
        '</td>' +
        '<td style="width:30%;text-align:right">' +
        '<a class="close" >×</a>' +
        '</td>' +
        '</tr>' +
        '</table>' +
        '</div>' +
        '<div id="dvModalBody" class="modal-body">' +
        '</div>' +
        '<div class="modal-footer" id="dvModalFooter">' +
        '<a class="btn" id="modalCancleButton" data-dismiss="modal" >Cancle</a>' +
        '<a class="btn" id="modalYesButton" data-dismiss="modal" >Yes</a>' +
        '</div>' +
        '</div>';
    $("body").append(modalDiv);
    $("#dvModalBody").html(header);
    $("#dvModal").modal({
        keyboard: false,
        backdrop: 'static',
        show: true
    });
};

this.msgBoxOkClick = function msgBoxOkClick() {
    this.returnValue = 3;
};

this.msgBoxCancleClick = function msgBoxCancleClick() {
    this.returnValue = 4;
};

and using it in our code like this,

var messagebox = new MsgBoxClass('message');

function msgboxcall() {
        messagebox.modalalert();
        return messagebox.returnvalue;

    }

But irrespective of button selection it always returning default value O. because execution wont halt until user selects the button.

Is there any way that i can pause the execution until user clicks on the button if his choice??

Please help me out.