Agregar Elemento funciona en FF, OPERA pero NO en MSIE

[k-seraph]

Hola, tengo un problema al agregar un elemento (bueno, es un html de un formulario) al selecionar un boton de radio se debe mostar en la parte de abajo. Lo hace en Firefox y Opera, pero no en Internet Explorer.

A continuacion el codigo el cual agradezco hecharle un ojo pues no veo el error.

Código:

function more(option){
 var html="";

 if(option=="alsc_quest"){

<?php
 if(getLoginStatus()){
?>
  html ="<form action=\"alsc.phtml?name=alasubasta&file=submit&type=alsc_quest\" method=\"POST\">\n";
  html +="<input name=\"username\" type=\"hidden\" value=\"<?echo getUserName(); ?>\">\n";
  html +="<b>Envíenos su pregunta o comentario</b><br><br>\n";
  html +="<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"border-collapse: collapse\" bordercolor=\"#111111\" width=\"100%\" id=\"AutoNumber1\" height=\"32\">\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\">Usuario</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><b><?echo getUserName(); ?></b></td>\n";
  html +="  </tr>\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\">Asunto</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><input type=\"text\" name=\"subject\" size=\"41\" maxlength=\"155\"></td>\n";
  html +="  </tr>\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\" valign=\"top\">Mensaje</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><textarea rows=\"8\" name=\"text\" cols=\"47\"></textarea></td>\n";
  html +="  </tr>\n";
  html +="</table>\n";
  html +="<p align=\"center\"><input type=\"submit\" name=\"submit\" value=\"Enviar\" onClick=\"return alsc_quest(this.form);\"></p></form> \n";
<?php
 }
  else{
?>
  html ="<b><p align=\"center\">Debe iniciar sesión para utilizar esta función!<br></b>\n";
  html +="[<a href=\"alsc.phtml?name=mialasubasta&goto=name*alasubasta$file*contact\">Entrar AlaSubasta!</a>]</p><br>\n";

<?php
  }
?>
 }

 if(option=="general_quest"){
  html ="<form action=\"alsc.phtml?name=alasubasta&file=submit&type=general_quest\" method=\"POST\">\n";
  html +="<b>Envíenos su pregunta o comentario</b><br><br>\n";
  html +="<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"border-collapse: collapse\" bordercolor=\"#111111\" width=\"100%\" id=\"AutoNumber1\" height=\"32\">\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\">Nombre</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><input type=\"text\" name=\"nombre\" size=\"41\" maxlength=\"55\" onKeyPress=\"return OnlyLetter(event)\"></td>\n";
  html +="  </tr>\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\">E-mail</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><input type=\"text\" name=\"email\" size=\"41\" maxlength=\"55\" onKeyPress=\"return OnlyEmail(event)\"></td>\n";
  html +="  </tr>\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\">Asunto</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><input type=\"text\" name=\"subject\" size=\"41\" maxlength=\"155\"></td>\n";
  html +="  </tr>\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\" valign=\"top\">Mensaje</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><textarea rows=\"8\" name=\"text\" cols=\"47\"></textarea></td>\n";
  html +="  </tr>\n";
  html +="</table>\n";
  html +="<p align=\"center\"><input type=\"submit\" name=\"submit\" value=\"Enviar\" onClick=\"return general_quest(this.form);\"></p></form> \n";
 }

 if(option=="comments"){
  html ="<form action=\"alsc.phtml?name=alasubasta&file=submit&type=comments\" method=\"POST\">\n";
  html +="<b>Envíenos su opinión o comentario</b><br><br>\n";
  html +="<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" style=\"border-collapse: collapse\" bordercolor=\"#111111\" width=\"100%\" id=\"AutoNumber1\" height=\"32\">\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\">Asunto:</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><input type=\"text\" name=\"subject\" size=\"41\" maxlength=\"155\"></td>\n";
  html +="  </tr>\n";
  html +="  <tr>\n";
  html +="    <td width=\"22%\" height=\"18\" valign=\"top\">Mensaje</td>\n";
  html +="    <td width=\"78%\" height=\"18\"><textarea rows=\"8\" name=\"text\" cols=\"47\"></textarea></td>\n";
  html +="  </tr>\n";
  html +="</table>\n";
  html +="<p align=\"center\"><input type=\"submit\" name=\"submit\" value=\"Enviar\" onClick=\"return comments(this.form);\"></p></form> \n";
  }

     window.document.getElementById('extra').innerHTML = html;
}

saludos a todos y de antemano gracias por su ayuda.