//Für erweiterbare Sektionen

function doSection (section,chgif){
	if (section.style.display=="none"){section.style.display="";chgif.src="on.gif"}
	else{section.style.display="none";chgif.src="off.gif"}
}

function noSection (section,chgif){
	if (section.style.display==""){section.style.display="";chgif.src="on.gif"}
}