url to open in the default browser of the client

I want the url to open in the default browser of the client. Can anyone help me how to achieve this.. I want to do this on Client side… Can we do this on Javascript.. Please suggest. I am just stuck in here…
I am able to get the alert with the url but just not able to open a new window in default browser…
<script type=”text/javascript”><![CDATA[
function test(tbxss){
alert(‘testing’ + tbxss);
window.external.openUrl(‘http://www.google.com‘);
}
]]></script>

Or suggest someother way please but it has to be done on the clients default browser and not a server side…

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