function zeigen(Element) {
	var Element;
	if(Element.id == "prog") {	
		if(document.getElementById("11").className == "unsichtbar") {
			document.getElementById("11").className = "sichtbar";
			document.getElementById("22").className = "unsichtbar";
		}
		else {
			document.getElementById("11").className = "unsichtbar";
			document.getElementById("22").className = "unsichtbar";
		}
	}
	else if(Element.id == "interp") {
		if(document.getElementById("22").className == "unsichtbar") {
			document.getElementById("22").className = "sichtbar";
			document.getElementById("11").className = "unsichtbar";
		}
		else {
			document.getElementById("22").className = "unsichtbar";
			document.getElementById("11").className = "unsichtbar";
		}
	}
}
function pruefen1() {
	var alles_ok = true;
	var EPO = document.getElementById("epo");
	ID_E = EPO.options[EPO.selectedIndex].value;
	var INTER = document.getElementById("inter");
	ID_I = INTER.options[INTER.selectedIndex].value;
	var BEG1 = document.getElementById("beg1").value;
	if(ID_E == "no" && ID_I == "no" && BEG1.length<2) {
		alles_ok = false;
	}
	return alles_ok;
}
function pruefen2() {
	var alles_ok = true;
	var PROG = document.getElementById("progr");
	ID_P = PROG.options[PROG.selectedIndex].value;
	var BES = document.getElementById("bes");
	ID_B = BES.options[BES.selectedIndex].value;
	var BEG2 = document.getElementById("beg2").value;
	if(ID_P == "no" && ID_B == "no" && BEG2.length<2) {
		alles_ok = false;
	}
	return alles_ok;
}
function schliessen() {
	document.getElementById("ergebnis").className = "unsichtbar";
}