And one more for newpost.tpl
<input type="button" name="preview" value="{$lang.DO_PREVIEW}" class="form-button" onclick="doPreview();"/>
replace with:
<input type="button" tabindex="4" name="preview" value="{$lang.DO_PREVIEW}" class="form-button" onclick="doPreview();"/>
edit:
I attached a text file with all the fixes in it, it's easier to read.