var CheckboxValue = 0;

function setGasValue()
{
	var GasValue = 0;
	
	var firstValue = parseInt(document.getElementById("anlage").value);
	var secondValue = parseInt(document.getElementById("erweiterung").value);

	GasValue = firstValue + secondValue + CheckboxValue;
	
	document.getElementById("EuroSpar").innerHTML = GasValue+",00";
	document.getElementById("spar_view").style.visibility = "visible";
	
	if(GasValue == 0)
	{
		document.getElementById("spar_view").style.visibility = "hidden";
	}
}

function setCheckboxValue()
{
	CheckboxValue = 0
	for(var i = 1; i <= 4; i++)
	{
		if(document.getElementById("Check"+i).checked)
		{
			CheckboxValue += parseInt(document.getElementById("Check"+i).value);
		}
	}
	setGasValue();
}