Thank you for the quick answer.
I actually made it on my own

before reading your post but now I have run in to another problem.
Is there a way to make my website input field have "http://" as default when the guestbook loads?
So far I can only make it show up after i have submitted a message by altering this code:
newEntry.onLoad = function(success){
if(success){
_parent._parent.write.gb_status.text = this.gb_status;
_parent._parent.read.loadEntries("Default", 10);
// Clear fields
_parent._parent.write.yourname.text = "";
_parent._parent.write.youremail.text = "";
_parent._parent.write.yourwebsite.text = "http://";
_parent._parent.write.yourcomments.text = "";
}
}
}