if (document.images) { 

image1on = new Image(); image1on.src = "pix/main/home_.gif"; 
image2on = new Image(); image2on.src = "pix/main/unterricht_.gif"; 
image3on = new Image(); image3on.src = "pix/main/termine_.gif"; 
image4on = new Image(); image4on.src = "pix/main/raumlichkeit_.gif"; 
image5on = new Image(); image5on.src = "pix/main/kontakt_.gif"; 
image6on = new Image(); image6on.src = "pix/main/service_.gif"; 
image7on = new Image(); image7on.src = "pix/main/tipps_.gif"; 

image1off = new Image(); image1off.src = "pix/main/home.gif"; 
image2off = new Image(); image2off.src = "pix/main/unterricht.gif"; 
image3off = new Image(); image3off.src = "pix/main/termine.gif"; 
image4off = new Image(); image4off.src = "pix/main/raumlichkeit.gif"; 
image5off = new Image(); image5off.src = "pix/main/kontakt.gif"; 
image6off = new Image(); image6off.src = "pix/main/service.gif"; 
image7off = new Image(); image7off.src = "pix/main/tipps.gif"; 

} 
function turnOn(imageName) { 
if (document.images) { 
document[imageName].src = eval(imageName + "on.src"); 
} 
} 

function turnOff(imageName) { 
if (document.images) { 
document[imageName].src = eval(imageName + "off.src"); 
} 
} 
// -->