Shoutbox

I've got a little question. I want to make the toast use different words in the text. For example:
Person has just arrived in his/hers car

And I want the car-word to be many diffrent things. What will i need to write in then?

And one more question:
In the script, I have wrote this for the toast:
function OnEvent_ContactSignin(Email){
var contacmail = Email;
signedincontact = Messenger.MyContacts.GetContact(contactemail);
      if(signedincontact.Blocked!=true){
{
        var Message = signedincontact.Name+ "has just arrived in is/hers car"+.;
        Message = MsgPlus.RemoveFormatCodes(Message);
        MsgPlus.DisplayToast("", Message);
}

But it says that it is wrong in the var message thin. What is wrong?

Thanks in advance