var oldVal;
var helpVal;

		
function matrixUpdateSum(spanID, value) {
	var spanObj = document.getElementById(spanID);
	var fieldVal = parseFloat(value);
	
	fieldVal = fieldVal.toFixed(2);
	if (fieldVal == 'NaN') {
		fieldVal = 0;
		
	}
	
	oldVal = parseFloat(oldVal).toFixed(2);
	if (oldVal == 'NaN') {
		oldVal = 0;
	}
	
	var newVal = parseFloat(oldVal) - fieldVal;
	var spanVal = parseFloat(spanObj.innerHTML).toFixed(2);

	
	if (spanVal == 'NaN') {
		spanVal = oldVal;
	}
	
	spanVal = (spanVal - newVal).toFixed(2);
	if (spanVal == 'NaN') {
		spanObj.innerHTML = 'Keine Zahl';
	}
	else
		spanObj.innerHTML = spanVal;
}

function checkWeiterButton(selectBox) {
	var sBox = document.getElementById(selectBox);
	if (sBox.selectedIndex == sBox.options.length - 1) {
		if (selectBox == 'erg_bed_vz')
			document.location='ergebnis-energietraeger';
		if (selectBox == 'erg_tr_vz')
			document.location='submit';
	}
	else {
		sBox.selectedIndex++;
		sBox.onchange();
	}
	// document.change_vz.erg_bed_vz.selectedIndex = (document.change_vz.erg_bed_vz.selectedIndex+1) % '.$anz.'; document.change_vz.erg_bed_vz.onchange();
}

function showHiddenInfoOnHover(divID) {

	var divElem = document.getElementById(divID);
	
	divElem.style.top=(ypos-120)+"px";
	divElem.style.left=(xpos-210)+"px";
	divElem.style.visibility="visible";
}

function hideHiddenInfoOnMouseout(divID) {
	var divElem = document.getElementById(divID);
	divElem.style.visibility='hidden';
}