[Андрей_Ш]

<script language="javascript">
  function zzwrite( )
  {
   document.form1.textarea1.value = "fuck";
  }
 </script>
 <form name="form1">
  <input type="button" value="Submit" onClick="zzwrite( );">
  <input type="text" name="textarea1" size="5">
 </form>