var count = setInterval('zaehlenTellaFriend()', 100);
var max = 1000;

function zaehlenTellaFriend() {
	
	if (document.getElementById("tellaFriendTextInput") == null) return;
	
  z = document.getElementById("tellaFriendTextInput").value;
  anz = z.length;
  
  if(anz >= max) {
    anz = max;
    document.getElementById("tellaFriendTextInput").value = z.substr(0,1000);
  }
  
  document.getElementById("tellaFriendCounter").value = max - anz;
}