Shoutbox

code:

---

if(!MessengerStart){

//code that first only on an import as messenger has already been started
//it is possible to import a script without being logged in, but who really does that?

}

---

EDIT: You could also just check if the first one exists, if it does thn it will cycle through the rest (unless they relate to different versions, and then you need one from each version).