function navOff(Image)       {document.images[Image].src='../Bilder/Logos/NavBar.png';return true;}
function navLeft(Image)      {document.images[Image].src='../Bilder/Logos/NavBarLeft.png';return true;}
function navRight(Image)     {document.images[Image].src='../Bilder/Logos/NavBarRight.png';return true;}
function navTop(Image)       {document.images[Image].src='../Bilder/Logos/NavBarTop.png';return true;}