function MsgBox (textstring) {
	if (confirm ('Sicher?')) { return true; }
	else { return false; }
	}

flag=1;
function ExtraInfo() {

	if (flag==0) {
		document.getElementById("extrainfo").style.display="none";
		flag=1;
		}
	else {
		document.getElementById("extrainfo").style.display="block";
		flag=0;
		}
	}