Need JavaScript to verify Social Security Number or Tax ID

Hello,

I need a JavaScript to verify that a Social Security Number (123-45-6789) or Tax ID (12-3456789) has been entered correctly in a form field. 

I'd like it to accept hyphens, and in case the user doesn't enter a hyphen, to automatically place them.  It should also not accept letters or any other special characters. 

If entered incorrectly, an alert message with pop-up.

The reason why I cannot use the Special category inn the Format tab is because I need a custom message in the alert box, not the default one Acrobat provides.

Any help would be greatly appreciated!

Thanks.