<!--

if (document.images) {

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  image3on = new Image();
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  image4on = new Image();
  image4on.src = "./nav/lectures_on.gif";
  
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  image5on = new Image();
  image5on.src = "./nav/test_on.gif"; 
     
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  image5off.src = "./nav/test_off.gif"; 
  
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  image6on.src = "./nav/port_on.gif";
 
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}

function changeImages() {
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}

// -->