TinyMCE is a crossbrowser RTE: if a function like this only works in IE it should not be in there at all.

You can download the IESpell ActiveX control from here.

http://www.iespell.com/download.php

Installation Instructions

  1. Copy the iespell directory to the plugins directory of TinyMCE (/jscripts/tiny_mce/plugins).
  2. Add plugin to TinyMCE plugin option list example: plugins : "iespell".
  3. Add the iespell button name to button list, example: theme_advanced_buttons3_add : "iespell".

Initialization Example

tinyMCE.init({
theme : "advanced",
mode : "textareas",
plugins : "iespell",
theme_advanced_buttons3_add : "iespell"
});