I can not say in how many browsers this will work but both Firefox and IE 6+ understands it.
<form>
<select onchange="this.form.elements['by'].value=this.options[this.selectedIndex].getAttribute('by');">
<option by="Tumpeville">3556
<option by="Dorkville">2000
</select>
<input type="text" value="" id="by">
</form>
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Min side ->www.the-hive.dk/~donp/