Versuch mal:
<script language="JavaScript">
<!--
function aniksen()
{
if (document.blabla.T1.value != "")
{
document.blabla.R2.checked=true;
}
}
// -->
</script>
lkjdsajfsa</p>
</p>
<form name="blabla">
<input type="radio" value="V1" checked name="R1"></p>
<input type="radio" name="R2" value="V2"><input type="text" name="T1" size="20" OnChange="aniksen()"></p>
</form>
also kurzgesagt document.blabla.R2.checked=true
ok?
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