function showDiv(divId) {
    if ( divId != "" ) {
	var re = new RegExp("^sub");
        navi=divId.replace(re,"");
	subnavi="sub"+navi;
        document.getElementById(subnavi).style.visibility = "visible";
    }
}
function hideDiv(divId) {
    if ( divId != "" ) {
	var re = new RegExp("^sub");

	navi=divId.replace(re,"");
	subnavi="sub"+navi;
	document.getElementById(subnavi).style.visibility = "hidden";
    }
}

function aendern(wert,wert3){
  if(wert){
    var wert1 = '';
    var wert2 = wert1 + wert;
    bild = new Image();
    bild.src = wert2;
    imgOn = eval('bild.src');
    document[wert3].src = imgOn;
  }
}