var actNr=1;

function setnractive(totalAmount,groupId,classActive,classNActive,ownNumber,direction){
	if (direction=="back" && ownNumber==""){ if (actNr>1){ ownNumber=actNr-1; changecontents('galeriebild'+ownNumber); }else{ ownNumber=1; }}
	if (direction=="forward" && ownNumber==""){ if (actNr<totalAmount){ ownNumber=actNr+1; changecontents('galeriebild'+ownNumber); }else{ ownNumber=totalAmount; }}
	for (i=1;i<=totalAmount;i++){
		if (i==ownNumber){ document.getElementById(groupId+"-"+i).className=classActive; actNr=i; }else{ document.getElementById(groupId+"-"+i).className=classNActive; }
	}
}