用JS应该容易的。
<form name="form1" method="post" action="">
<input type=radio name=a onclick="content.value='hello'">
<input type=radio name=a onclick="content.value='you'">
<textarea name="content" id="content"></textarea>
</form>
<form name="form1" method="post" action="">
<input type=radio name=a onclick="content.value='hello'">
<input type=radio name=a onclick="content.value='you'">
<textarea name="content" id="content"></textarea>
</form>
$result=mysql_query(....);
<form name="form1" method="post" action="文件名">
<input type=radio name=a onclick="content.value='<?echo mysql_result($result,0,"$hello");?>'">
<input type=radio name=a onclick="content.value='<?echo mysql_result($result,0,"$you");?>'">
.
.
.
</form>