If radio button is selected show alert

I want an alert to show when i click a radio button.

My radio buttons:

<div class="genericFormField">
   New:@Html.RadioButtonFor(m => m.Form.InstallType, 1, Model.InstallationHeader.InstallType == 1 ? new { Checked = "checked" } : null )
   Pool:@Html.RadioButtonFor(m => m.Form.InstallType, 2, Model.InstallationHeader.InstallType == 2 ? new { Checked = "checked" } : null)
   Refurb:@Html.RadioButtonFor(m => m.Form.InstallType, 3, Model.InstallationHeader.InstallType == 3 ? new { Checked = "checked" } : null)              
</div>

So if the radio button new is selected i want an alert to say "NEW" otherwise nothing.

Normally it is easy because you have id but in this occasion there is no ID?

As this is RadioButtonFor.

Thanks