JQuery :: Confirm Dialog Box - Callback Function

I'm trying to build a confirm dialog box. If found a nice plugin [URL] but the behavior is not like a normal confirm dialog box. You have to add a callback function to react on the ok/cancel buttons. Is it possible the simulate this behavior so I can have a function like this:
function showConfirmation(title, text){
//this displays a jQuery Dialog form and returns true/false
return myjQueryConfirm(title, text);
}

I tried this with the plugin:
function showConfirmation(title, text){
var res;
jConfirm(title, text, function (r) { res = r;});
return res;
}
But after the jConfirm is executed, the function proceeds and immediately returns res which is not defined.