var overviewBoxOld = "";

function overviewBoxover(wert){
  if(overviewBoxOld != wert && document.getElementById(wert)){
        window.addEvent('domready', function() {
            if(overviewBoxOld != ""){  
               $(overviewBoxOld).fade('0');
            }
            $(wert).set('opacity', '0');
            $(wert).fade('0.8');
            overviewBoxOld = wert;
        });
  }
}

/*
function overviewBoxout(wert){
  if(document.getElementById(wert)){
        window.addEvent('domready', function() {
            $(wert).fade('0.1');
        });
  }
}*/