Hi,
Dachte ja immer dass nur _"_ richtig korrekt waere, aber laut http://www.w3.org/TR/html4/intro/sgmltut.html#idx-attribute-6 ist beides moeglich:
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By default, SGML requires that all attribute values be delimited using either double quotation marks (ASCII decimal 34) or single quotation marks (ASCII decimal 39).
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Gruss, Mel