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    $mech->submit_form(
        form_name =>'post',
...
              'content'         => $content    
            }
    ) or die "Error: $!";

<input type="text" id="new-tag-post_tag" name="newtag[post_tag]"

<input value="1" type="checkbox" name="post_category[]

<textarea rows='20' class='theEditor' cols='40' name='content' tabinde
+x='2'