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img28on.src = "images/exhibitspec_anhang_but_on.gif"

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img17on.src = "images/exhibitspec_mammuthus_but_on.gif"

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var img25on = new Image();
img25on.src = "images/exhibitspec_xiphac_but_on.gif"

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function imgon(name)  {
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document[name].src = eval(name + "on.src");}
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function imgoff(name)  {
if (document.images){
document[name].src = eval(name + ".src");}
} 
//--->