function ClearName(){
  if(document.contactform.name.value=="Vorname, Name") document.contactform.name.value="";
}
function UnclearName(){
  if(document.contactform.name.value=="") document.contactform.name.value="Vorname, Name";
}
function ClearMail(){
  if(document.contactform.email.value=="E-Mail") document.contactform.email.value="";
}
function UnclearMail(){
  if(document.contactform.email.value=="") document.contactform.email.value="E-Mail";
}
function ClearSubject(){
  if(document.contactform.betreff.value=="Betreff") document.contactform.betreff.value="";
}
function UnclearSubject(){
  if(document.contactform.betreff.value=="") document.contactform.betreff.value="Betreff";
}
function ClearMessage(){
  if(document.contactform.nachricht.value=="Nachricht") document.contactform.nachricht.value="";
}
function UnclearMessage(){
  if(document.contactform.nachricht.value=="") document.contactform.nachricht.value="Nachricht";
}
function ShowHide(uid) {
	if(document.getElementById) {
		document.getElementById("_"+uid).style.visibility = "visible";
	}
	return true;
}