Vorrei utilizzare il seguente script per far si che si possa formattare il testo scritto in una textarea. In particolare, una volta digitato il testo, selezionandolo, si dovrà poter cambiare il carattere, il suo colore e la dimensione. Ma non va, perchè?


<script language="JavaScript">
function FormatTextShort(command, option){

id_risposta.messaggio.document.execCommand(command , true, option);
id_risposta.messaggio.focus();
}
</script>


<select name="selectShortText" onChange="FormatTextShort('FontName', selectShortText.options[selectShortText.selectedIndex].value);document.messaggio.selectShortText.options[0].selected = true;" >
<option value="0" selected>-- Font Type --</option>
<option value="Arial, Helvetica, sans-serif">Arial</option>
<option value="Times New Roman, Times, serif">Times</option>
<option value="Courier New, Courier, mono">Courier New</option>
<option value="Verdana, Arial, Helvetica, sans-serif">Verdana</option>
</select>

<select name="selectShortFontSize" onChange="FormatTextShort('FontSize', selectShortFontSize.options[selectShortFontSize.selectedIndex].value);document.messaggio.selectShortFontSize.opt ions[0].selected = true;" >
<option value="0" selected>-- Font Size --</option>
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
</select>

<select name="selectShortFontColour" onChange="FormatTextShort('ForeColor', selectShortFontColour.options[selectShortFontColour.selectedIndex].value);document.messaggio.selectShortFontColour.o ptions[0].selected = true;" >
<option value="0" selected>-- Font Colour --</option>
<option value="black">Black</option>
<option value="white">White</option>
<option value="blue">Blue</option>
<option value="red">Red</option>
<option value="green">Green</option>
<option value="yellow">Yellow</option>
<option value="orange">Orange</option>
<option value="brown">Brown</option>
<option value="magenta">Magenta</option>
<option value="cyan">Cyan</option>
<option value="limegreen">Lime Green</option>
</select>

<font color="#FFFFFF">
<input type="hidden" name="id_risposta" value="<%=id%>">


<textarea name="messaggio" rows="10" style="width: 500"></textarea>


</font>

<input name="submit" type="submit" value="Rispondi" style="height: 17px; color: #000000; background-color: #99CC00; border-top : 1px solid; border-bottom : 1px solid; border-left : 1px solid; border-right : 1px solid; border-color: #ffffff; font-family : Verdana,tahoma,Arial; font-size : 10px; font-weight: bold;">
</form>