function unlinkelements(SelectName)
{
	MySelect = document.getElementById(SelectName);
	MySelect.options.length = 0;
}

function countelements(arrValid,arrModules)
{
	// js method does no work with array.lenght = 1, use Dummy instead
	count = 0;
	
	for (i in arrValid) {	
		if (arrValid[i] != "Dummy") {
			count++;
		} // end if (arrValid[i] != "Dummy") {
	
	} // end for (i in arrValid) {	
	
	return count;
}

function updateelements(Selectname,blank,arrValues,arrValid,choices,arrSelected) 
{
	unlinkelements(Selectname);
	
	// js function lenght does not work with a single element arrays, use dummy an function
	total = countelements(arrValid,arrValues);
	
	is_selected = false;
	if (total == choices) is_selected = true;
	
	MySelect = document.getElementById(Selectname);
	
	if (total == 1) {
		
		myitem = new Option(arrValues[arrValid[0]]["Name"],arrValid[0],false,true);
		MySelect.options[MySelect.length] = myitem;
	
	} else {
		
		for (i in arrValid) {
			myitem = new Option(arrValues[arrValid[i]]["Name"],arrValid[i],false,is_selected);
			MySelect.options[MySelect.length] = myitem;
		} // end for (i in arrValid) {
	
	} // end if (total == 1)
}

function checkDependecies(Modulename) {
	
	for (i in Wahlmodul1) {
	 	if (Wahlmodul1[i] == Modulename) return true;
	} 
	for (i in Wahlmodul2) {
	 	if (Wahlmodul2[i] == Modulename) return true;
	}
	
	return false;
}

function setOpacity(myelement,value) {
	myelement.style.opacity = value/10;
	myelement.style.filter = 'alpha(opacity=' + value*10 + ')';
}

function init()
{
	if (!document.getElementById) {
		alert("Dieser Browser ist leider inkompatibel. Bitte verwenden Sie eine neuere Version.");
	}
	
	checkStep("WM1");
	checkStep("WM3");
	checkStep("WM2");
}