Open Dialog - SharePoint 2010

<script type="text/javascript">
function OpenDialog()
{
var options = SP.UI.$create_DialogOptions();
options.url = "http://bing.com";
options.width = 400;
options.height = 300;
options.dialogReturnValueCallback = Function.createDelegate(null, CloseCallback);
SP.UI.ModalDialog.showModalDialog(options);
}

function CloseCallback(result, target)
{
if(result === SP.UI.DialogResult.OK)
{
alert('You clicked OK');
}
}
</script>
<input type="button" value="Show Dialog" onclick="OpenDialog()" />