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[eluser]CroNiX[/eluser]
I'd just have 2 submit buttons with different names, then in the controller check which one was used.

Code:

<input type="submit" name="preview" value="Preview">
<input type="submit" name="send" value="Send">

Code:

if ($this->input->post('preview') !== FALSE)
{
  //do the preview
}