function openBrainMemo(){
    var gamewin = window.open('http://www.gehirntuning.com/brain-memo/game.html', 'BrainMemo', 'width=1000,height=600,left=200,top=100,location=no,menubar=no,status=no');
    gamewin.focus();
}

function openRequirements(){
    var requirewin = window.open('http://www.gehirntuning.com/teilnahmebedingungen.php', 'Teilnahmebedingungen', 'width=640,height=660,left=200,top=100,location=no,menubar=no,status=no');
    requirewin.focus();
}