In an InputScript we want to create an email alert so that help desk can be notified outside normal hours. I would like to first send a message box so that when OK is clicked email opens and can be sent. Is this possible?

You can use the  "-yesno" option of the Message command and then the Start command to send the email. Example:

Message "Do you want to report the problem via email?" -yesno

if q[ok]

  Start " with equipment number&body=please...."