Javascript Confirm popup Yes, No button instead of OK and Cancel
Unfortunately, there is no cross-browser support for opening a confirmation dialog that is not the default OK/Cancel pair. The solution you provided uses VBScript, which is only available in IE.
I would suggest using a Javascript library that can build a DOM-based dialog instead. Try Jquery UI: http://jqueryui.com/
The only way you can accomplish this in a cross-browser way is to use a framework like jQuery UI and create a custom Dialog:
It doesn't work in exactly the same way as the built-in confirm popup but you should be able to make it do what you want.
You can also use http://projectshadowlight.org/jquery-easy-confirm-dialog/ . It's very simple and easy to use. Just include jquery common library and one more file only:
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js" type="text/javascript"></script><script src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.2/jquery-ui.min.js"></script><link rel="stylesheet" href="http://ajax.googleapis.com/ajax/libs/jqueryui/1.7.1/themes/blitzer/jquery-ui.css" type="text/css" /><script src="jquery.easy-confirm-dialog.js"></script>