Wie wär's damit?
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function umlautex(wort)
{
wort=wort.replace(/ä/,"ae");
wort=wort.replace(/ö/,"oe");
wort=wort.replace(/ü/,"ue");
wort=wort.replace(/Ä/,"Ae");
wort=wort.replace(/Ö/,"Oe");
wort=wort.replace(/Ü/,"Ue");
wort=wort.replace(/ß/,"ss");
return wort;
}
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gruß, tom